[d694de] | 1 | //GMG, last modified 18.6.99 |
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[ebbe4a] | 2 | //anne, added deleteSublist and watchdog 12.12.2000 |
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[ca41246] | 3 | //eric, added absValue 11.04.2002 |
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[3d124a7] | 4 | /////////////////////////////////////////////////////////////////////////////// |
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[c60d60] | 5 | version="$Id: general.lib,v 1.58 2008-12-12 11:26:34 Singular Exp $"; |
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[49998f] | 6 | category="General purpose"; |
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[5480da] | 7 | info=" |
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[803c5a1] | 8 | LIBRARY: general.lib Elementary Computations of General Type |
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[3d124a7] | 9 | |
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[f34c37c] | 10 | PROCEDURES: |
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[0b59f5] | 11 | A_Z(\"a\",n); string a,b,... of n comma separated letters |
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[63be42] | 12 | ASCII([n,m]); string of printable ASCII characters (number n to m) |
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[ca41246] | 13 | absValue(c); absolute value of c |
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[fc62b67] | 14 | binomial(n,m[,../..]); n choose m (type int), [type bigint] |
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[ebbe4a] | 15 | deleteSublist(iv,l); delete entries given by iv from list l |
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[fc62b67] | 16 | factorial(n[,../..]); n factorial (=n!) (type int), [type bigint] |
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[3d124a7] | 17 | fibonacci(n[,p]); nth Fibonacci number [char p] |
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[dd2aa36] | 18 | kmemory([n[,v]]); active [allocated] memory in kilobyte |
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[3d124a7] | 19 | killall(); kill all user-defined variables |
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| 20 | number_e(n); compute exp(1) up to n decimal digits |
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| 21 | number_pi(n); compute pi (area of unit circle) up to n digits |
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| 22 | primes(n,m); intvec of primes p, n<=p<=m |
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| 23 | product(../..[,v]); multiply components of vector/ideal/...[indices v] |
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| 24 | sort(ideal/module); sort generators according to monomial ordering |
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| 25 | sum(vector/id/..[,v]); add components of vector/ideal/...[with indices v] |
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[ebbe4a] | 26 | watchdog(i,cmd); only wait for result of command cmd for i seconds |
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[63be42] | 27 | which(command); search for command and return absolute path, if found |
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[298d0a] | 28 | primecoeffs(J[,q]); primefactors <= min(p,32003) of coeffs of J |
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[90d772] | 29 | primefactors(n[,p]); primefactors <= min(p,32003) of n |
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| 30 | timeStd(i,d) std(i) if the standard basis computation finished |
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| 31 | after d-1 seconds and i otherwhise |
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| 32 | timeFactorize(p,d) factorize(p) if the factorization finished after d-1 |
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| 33 | seconds otherwhise f is considered to be irreducible |
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| 34 | factorH(p) changes variables to become the last variable the |
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| 35 | principal one in the multivariate factorization and |
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| 36 | factorizes then the polynomial |
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| 37 | |
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[194f5e5] | 38 | (parameters in square brackets [] are optional) |
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[5480da] | 39 | "; |
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| 40 | |
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[3d124a7] | 41 | LIB "inout.lib"; |
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[8b87364] | 42 | LIB "poly.lib"; |
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| 43 | LIB "matrix.lib"; |
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[3d124a7] | 44 | /////////////////////////////////////////////////////////////////////////////// |
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| 45 | |
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| 46 | proc A_Z (string s,int n) |
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[d2b2a7] | 47 | "USAGE: A_Z(\"a\",n); a any letter, n integer (-26<= n <=26, !=0) |
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[3d124a7] | 48 | RETURN: string of n small (if a is small) or capital (if a is capital) |
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[0b59f5] | 49 | letters, comma separated, beginning with a, in alphabetical |
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[a7a00b] | 50 | order (or reverse alphabetical order if n<0) |
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[3d124a7] | 51 | EXAMPLE: example A_Z; shows an example |
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[d2b2a7] | 52 | " |
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[3d124a7] | 53 | { |
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| 54 | if ( n>=-26 and n<=26 and n!=0 ) |
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| 55 | { |
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| 56 | string alpha = |
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| 57 | "a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z,"+ |
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| 58 | "a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z,"+ |
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| 59 | "A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z,"+ |
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| 60 | "A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z"; |
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| 61 | int ii; int aa; |
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| 62 | for(ii=1; ii<=51; ii=ii+2) |
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| 63 | { |
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| 64 | if( alpha[ii]==s ) { aa=ii; } |
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| 65 | } |
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| 66 | if ( aa==0) |
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| 67 | { |
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| 68 | for(ii=105; ii<=155; ii=ii+2) |
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| 69 | { |
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| 70 | if( alpha[ii]==s ) { aa=ii; } |
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| 71 | } |
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| 72 | } |
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| 73 | if( aa!=0 ) |
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| 74 | { |
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| 75 | string out; |
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| 76 | if (n > 0) { out = alpha[aa,2*(n)-1]; return (out); } |
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| 77 | if (n < 0) |
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| 78 | { |
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| 79 | string beta = |
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| 80 | "z,y,x,w,v,u,t,s,r,q,p,o,n,m,l,k,j,i,h,g,f,e,d,c,b,a,"+ |
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| 81 | "z,y,x,w,v,u,t,s,r,q,p,o,n,m,l,k,j,i,h,g,f,e,d,c,b,a,"+ |
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| 82 | "Z,Y,X,W,V,U,T,S,R,Q,P,O,N,M,L,K,J,I,H,G,F,E,D,C,B,A,"+ |
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| 83 | "Z,Y,X,W,V,U,T,S,R,Q,P,O,N,M,L,K,J,I,H,G,F,E,D,C,B,A"; |
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| 84 | if ( aa < 52 ) { aa=52-aa; } |
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| 85 | if ( aa > 104 ) { aa=260-aa; } |
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| 86 | out = beta[aa,2*(-n)-1]; return (out); |
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| 87 | } |
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| 88 | } |
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| 89 | } |
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| 90 | } |
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| 91 | example |
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| 92 | { "EXAMPLE:"; echo = 2; |
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| 93 | A_Z("c",5); |
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| 94 | A_Z("Z",-5); |
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| 95 | string sR = "ring R = (0,"+A_Z("A",6)+"),("+A_Z("a",10)+"),dp;"; |
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| 96 | sR; |
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[034ce1] | 97 | execute(sR); |
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[3d124a7] | 98 | R; |
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| 99 | } |
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| 100 | /////////////////////////////////////////////////////////////////////////////// |
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[63be42] | 101 | proc ASCII (list #) |
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| 102 | "USAGE: ASCII([n,m]); n,m= integers (32 <= n <= m <= 126) |
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[a7a00b] | 103 | RETURN: string of printable ASCII characters (no native language support)@* |
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| 104 | ASCII(): string of all ASCII characters with its numbers,@* |
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| 105 | ASCII(n): n-th ASCII character@* |
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[b42ab6] | 106 | ASCII(n,m): n-th up to m-th ASCII character (inclusive) |
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[63be42] | 107 | EXAMPLE: example ASCII; shows an example |
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| 108 | " |
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| 109 | { |
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| 110 | string s1 = |
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[008846] | 111 | " ! \" # $ % & ' ( ) * + , - . |
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[63be42] | 112 | 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 |
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| 113 | / 0 1 2 3 4 5 6 7 8 9 : ; < = |
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| 114 | 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 |
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| 115 | > ? @ A B C D E F G H I J K L |
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| 116 | 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 |
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| 117 | M N O P Q R S T U V W X Y Z [ |
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| 118 | 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 |
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| 119 | \\ ] ^ _ ` a b c d e f g h i j |
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| 120 | 92 93 94 95 96 97 98 99 100 101 102 103 104 105 10 |
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| 121 | k l m n o p q r s t u v w x y |
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| 122 | 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 |
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| 123 | z { | } ~ |
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| 124 | 122 123 124 125 126 "; |
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| 125 | |
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| 126 | string s2 = |
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| 127 | " !\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~"; |
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| 128 | |
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| 129 | if ( size(#) == 0 ) |
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| 130 | { |
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| 131 | return(s1); |
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| 132 | } |
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| 133 | if ( size(#) == 1 ) |
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| 134 | { |
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| 135 | return( s2[#[1]-31] ); |
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| 136 | } |
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| 137 | if ( size(#) == 2 ) |
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| 138 | { |
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| 139 | return( s2[#[1]-31,#[2]-#[1]+1] ); |
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| 140 | } |
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| 141 | } |
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| 142 | example |
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| 143 | { "EXAMPLE:"; echo = 2; |
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| 144 | ASCII();""; |
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| 145 | ASCII(42); |
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| 146 | ASCII(32,126); |
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| 147 | } |
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| 148 | /////////////////////////////////////////////////////////////////////////////// |
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[3d124a7] | 149 | |
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[ca41246] | 150 | proc absValue(def c) |
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[298d0a] | 151 | "USAGE: absValue(c); c int, number or poly |
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[ca41246] | 152 | RETURN: absValue(c); the absolute value of c |
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| 153 | NOTE: absValue(c)=c if c>=0; absValue=-c if c<=0. |
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| 154 | @* So the function can be applied to any type, for which comparison |
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[298d0a] | 155 | @* operators are defined. |
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[ca41246] | 156 | EXAMPLE: example absValue; shows an example |
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| 157 | " |
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| 158 | { |
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| 159 | if (c>=0) { return(c); } |
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| 160 | else { return(-c); } |
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| 161 | } |
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| 162 | example |
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| 163 | { "EXAMPLE:"; echo = 2; |
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| 164 | ring r1 = 0,x,dp; |
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| 165 | absValue(-2002); |
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| 166 | |
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| 167 | poly f=-4; |
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| 168 | absValue(f); |
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| 169 | } |
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| 170 | /////////////////////////////////////////////////////////////////////////////// |
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| 171 | |
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[fc62b67] | 172 | proc binomial (int n, int k) |
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| 173 | "USAGE: binomial(n,k); n,k integers |
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[b42ab6] | 174 | RETURN: binomial(n,k); binomial coefficient n choose k |
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[fc62b67] | 175 | @* - of type bigint (computed in characteristic 0) |
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[c860e9] | 176 | NOTE: In any characteristic, binomial(n,k) = coefficient of x^k in (1+x)^n |
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[b42ab6] | 177 | SEE ALSO: prime |
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[3d124a7] | 178 | EXAMPLE: example binomial; shows an example |
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[d2b2a7] | 179 | " |
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[3d124a7] | 180 | { |
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[fc62b67] | 181 | bigint l; |
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| 182 | bigint r=1; |
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| 183 | bigint kk=k; |
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| 184 | bigint nn=n; |
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| 185 | if ( k > n-k ) |
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| 186 | { k = n-k; } |
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| 187 | if ( k<=0 or k>n ) //trivial cases |
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| 188 | { r = (k==0)*r; } |
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| 189 | for (l=1; l<=kk; l=l+1 ) |
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[c860e9] | 190 | { |
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[fc62b67] | 191 | r=r*(nn+1-l)/l; |
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[c860e9] | 192 | } |
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[fc62b67] | 193 | return(r); |
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| 194 | } |
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[3d124a7] | 195 | example |
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| 196 | { "EXAMPLE:"; echo = 2; |
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[883957] | 197 | binomial(200,100);""; //type bigint |
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[c860e9] | 198 | int n,k = 200,100; |
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[883957] | 199 | bigint b1 = binomial(n,k); |
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[c860e9] | 200 | ring r = 0,x,dp; |
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[883957] | 201 | poly b2 = coeffs((x+1)^n,x)[k+1,1]; //coefficient of x^k in (x+1)^n |
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| 202 | b1-b2; //b1 and b2 should coincide |
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[c860e9] | 203 | } |
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| 204 | /////////////////////////////////////////////////////////////////////////////// |
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| 205 | |
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| 206 | static proc binomp (int n, int k, int p) |
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| 207 | //computes binomial coefficient n choose k in basering of char p > 0 |
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| 208 | //binomial(n,k) = coefficient of x^k in (1+x)^n. |
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| 209 | //Let n=q*p^j, gcd(q,p)=1, then (1+x)^n = (1 + x^(p^j))^q. We have |
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| 210 | //binomial(n,k)=0 if k!=l*p^j and binomial(n,l*p^j) = binomial(q,l). |
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| 211 | //Do this reduction first. Then, in denominator and numerator |
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| 212 | //of defining formula for binomial coefficient, reduce those factors |
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| 213 | //mod p which are not divisible by p and cancel common factors p. Hence, |
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| 214 | //if n = h*p+r, k=l*p+s, r,s<p, binomial(n,k) = binomial(r,s)*binomial(h,l) |
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| 215 | { |
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| 216 | int l,q,i= 1,n,1; |
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| 217 | number r=1; |
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| 218 | if ( k > n-k ) |
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| 219 | { k = n-k; |
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| 220 | } |
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| 221 | if ( k<=0 or k>n) //trivial cases |
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| 222 | { r = (k==0)*r; |
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| 223 | } |
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| 224 | else |
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| 225 | { |
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| 226 | while ( q mod p == 0 ) |
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| 227 | { l = l*p; |
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| 228 | q = q div p; |
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| 229 | } //we have now n=q*l, l=p^j, gcd(q,p)=1; |
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| 230 | if (k mod l != 0 ) |
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| 231 | { r = 0; |
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| 232 | } |
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| 233 | else |
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| 234 | { l = k div l; |
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| 235 | n = q mod p; |
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| 236 | k = l mod p; //now 0<= k,n <p, use binom0 for n,k |
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| 237 | q = q div p; //recursion for q,l |
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| 238 | l = l div p; //use binomp for q,l |
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| 239 | r = binom0(n,k)*binomp(q,l,p); |
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| 240 | } |
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| 241 | } |
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| 242 | return(r); |
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[3d124a7] | 243 | } |
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| 244 | /////////////////////////////////////////////////////////////////////////////// |
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| 245 | |
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[fc62b67] | 246 | proc factorial (int n) |
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| 247 | "USAGE: factorial(n); n integer |
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| 248 | RETURN: factorial(n): n! of type bigint. |
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[b42ab6] | 249 | SEE ALSO: prime |
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| 250 | EXAMPLE: example factorial; shows an example |
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[d2b2a7] | 251 | " |
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[fc62b67] | 252 | { |
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| 253 | bigint r=1; |
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[c860e9] | 254 | //------------------------------ computation -------------------------------- |
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[a292211] | 255 | for (int l=2; l<=n; l++) |
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[3d124a7] | 256 | { |
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[f937e2] | 257 | r=r*l; |
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[3d124a7] | 258 | } |
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[fc62b67] | 259 | return(r); |
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[3d124a7] | 260 | } |
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| 261 | example |
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| 262 | { "EXAMPLE:"; echo = 2; |
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[fc62b67] | 263 | factorial(37);""; //37! (as long integer) |
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[3d124a7] | 264 | } |
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| 265 | /////////////////////////////////////////////////////////////////////////////// |
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| 266 | |
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[fc62b67] | 267 | proc fibonacci (int n) |
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| 268 | "USAGE: fibonacci(n); n,p integers |
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[b42ab6] | 269 | RETURN: fibonacci(n): nth Fibonacci number, f(0)=f(1)=1, f(i+1)=f(i-1)+f(i) |
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[fc62b67] | 270 | @* - computed in characteristic 0, of type bigint |
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[b42ab6] | 271 | SEE ALSO: prime |
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[3d124a7] | 272 | EXAMPLE: example fibonacci; shows an example |
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[d2b2a7] | 273 | " |
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[fc62b67] | 274 | { |
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| 275 | bigint f,g,h=1,1,1; |
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[c860e9] | 276 | //------------------------------ computation -------------------------------- |
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[f937e2] | 277 | for (ii=3; ii<=n; ii=ii+1) |
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[3d124a7] | 278 | { |
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[f937e2] | 279 | h = f+g; f = g; g = h; |
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[fc62b67] | 280 | } |
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| 281 | return(h); |
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[3d124a7] | 282 | } |
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| 283 | example |
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| 284 | { "EXAMPLE:"; echo = 2; |
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[b42ab6] | 285 | fibonacci(42); ""; //f(42) of type string (as long integer) |
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| 286 | ring r = 2,x,dp; |
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| 287 | number b = fibonacci(42,2); //f(42) of type number, computed in r |
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[c860e9] | 288 | b; |
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[3d124a7] | 289 | } |
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| 290 | /////////////////////////////////////////////////////////////////////////////// |
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| 291 | |
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[d694de] | 292 | proc kmemory (list #) |
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[b42ab6] | 293 | "USAGE: kmemory([n,[v]]); n,v integers |
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[a7a00b] | 294 | RETURN: memory in kilobyte of type bigint |
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[b42ab6] | 295 | @* n=0: memory used by active variables (same as no parameters) |
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| 296 | @* n=1: total memory allocated by Singular |
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[dd2aa36] | 297 | DISPLAY: detailed information about allocated and used memory if v!=0 |
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[d694de] | 298 | NOTE: kmemory uses internal function 'memory' to compute kilobyte, and |
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| 299 | is the same as 'memory' for n!=0,1,2 |
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[3d124a7] | 300 | EXAMPLE: example kmemory; shows an example |
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[d2b2a7] | 301 | " |
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[917fb5] | 302 | { |
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[d694de] | 303 | int n; |
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[dd2aa36] | 304 | int verb; |
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[d694de] | 305 | if (size(#) != 0) |
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| 306 | { |
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| 307 | n=#[1]; |
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[dd2aa36] | 308 | if (size(#) >1) |
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| 309 | { verb=#[2]; } |
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[d694de] | 310 | } |
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[917fb5] | 311 | |
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[dd2aa36] | 312 | if ( verb != 0) |
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| 313 | { |
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| 314 | if ( n==0) |
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| 315 | { dbprint(printlevel-voice+3, |
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| 316 | "// memory used, at the moment, by active variables (kilobyte):"); } |
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| 317 | if ( n==1 ) |
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| 318 | { dbprint(printlevel-voice+3, |
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| 319 | "// total memory allocated, at the moment, by SINGULAR (kilobyte):"); } |
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[c60d60] | 320 | } |
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| 321 | return ((memory(n)+1023) div 1024); |
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[3d124a7] | 322 | } |
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| 323 | example |
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| 324 | { "EXAMPLE:"; echo = 2; |
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| 325 | kmemory(); |
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[dd2aa36] | 326 | kmemory(1,1); |
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[3d124a7] | 327 | } |
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| 328 | /////////////////////////////////////////////////////////////////////////////// |
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| 329 | |
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| 330 | proc killall |
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[d2b2a7] | 331 | "USAGE: killall(); (no parameter) |
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| 332 | killall(\"type_name\"); |
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| 333 | killall(\"not\", \"type_name\"); |
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[b42ab6] | 334 | RETURN: killall(); kills all user-defined variables except loaded procedures, |
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| 335 | no return value. |
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| 336 | @* - killall(\"type_name\"); kills all user-defined variables, |
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| 337 | of type \"type_name\" |
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| 338 | @* - killall(\"not\", \"type_name\"); kills all user-defined variables, |
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| 339 | except those of type \"type_name\" and except loaded procedures |
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[65546eb] | 340 | @* - killall(\"not\", \"name_1\", \"name_2\", ...); |
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| 341 | kills all user-defined variables, except those of name \"name_i\" |
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[b42ab6] | 342 | and except loaded procedures |
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[3d124a7] | 343 | NOTE: killall should never be used inside a procedure |
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| 344 | EXAMPLE: example killall; shows an example AND KILLS ALL YOUR VARIABLES |
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[d2b2a7] | 345 | " |
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[3d124a7] | 346 | { |
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[48c165a] | 347 | if (system("with","Namespaces")) |
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| 348 | { |
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| 349 | list @marie=names(Top); |
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| 350 | } |
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| 351 | else |
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| 352 | { |
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| 353 | list @marie=names(); |
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| 354 | } |
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[09f420] | 355 | int j, no_kill, @joni; |
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[b42ab6] | 356 | for ( @joni=1; @joni<=size(#); @joni++) |
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[5c187b] | 357 | { |
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[b42ab6] | 358 | if (typeof(#[@joni]) != "string") |
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[5c187b] | 359 | { |
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[b42ab6] | 360 | ERROR("Need string as " + string(@joni) + "th argument"); |
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[5c187b] | 361 | } |
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| 362 | } |
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[65546eb] | 363 | |
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[5c187b] | 364 | // kills all user-defined variables but not loaded procedures |
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| 365 | if( size(#)==0 ) |
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| 366 | { |
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[b42ab6] | 367 | for ( @joni=size(@marie); @joni>0; @joni-- ) |
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[5c187b] | 368 | { |
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[48c165a] | 369 | if( @marie[@joni]!="LIB" and typeof(`@marie[@joni]`)!="proc" |
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| 370 | and typeof(`@marie[@joni]`)!="package") |
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[b42ab6] | 371 | { kill `@marie[@joni]`; } |
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[5c187b] | 372 | } |
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| 373 | } |
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| 374 | else |
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| 375 | { |
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| 376 | // kills all user-defined variables |
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| 377 | if( size(#)==1 ) |
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| 378 | { |
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| 379 | // of type proc |
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| 380 | if( #[1] == "proc" ) |
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[3d124a7] | 381 | { |
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[b42ab6] | 382 | for ( @joni=size(@marie); @joni>0; @joni-- ) |
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[5c187b] | 383 | { |
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[298d0a] | 384 | if( (@marie[@joni]!="General") |
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[48c165a] | 385 | and (@marie[@joni]!="Top") |
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| 386 | and (@marie[@joni]!="killall") |
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[298d0a] | 387 | and (@marie[@joni]!="LIB") and |
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| 388 | ((typeof(`@marie[@joni]`)=="package") or |
---|
| 389 | (typeof(`@marie[@joni]`)=="proc"))) |
---|
| 390 | { |
---|
| 391 | if (defined(`@marie[@joni]`)) {kill `@marie[@joni]`;} |
---|
| 392 | } |
---|
| 393 | if (!defined(@joni)) break; |
---|
[48c165a] | 394 | } |
---|
[298d0a] | 395 | if ((system("with","Namespaces")) && defined(General)) |
---|
[48c165a] | 396 | { |
---|
| 397 | @marie=names(General); |
---|
| 398 | for ( @joni=size(@marie); @joni>0; @joni-- ) |
---|
| 399 | { |
---|
| 400 | if(@marie[@joni]!="killall" |
---|
| 401 | and typeof(`@marie[@joni]`)=="proc") |
---|
| 402 | { kill General::`@marie[@joni]`; } |
---|
| 403 | } |
---|
| 404 | kill General::killall; |
---|
[5c187b] | 405 | } |
---|
[3d124a7] | 406 | } |
---|
[5c187b] | 407 | else |
---|
[65546eb] | 408 | { |
---|
[5c187b] | 409 | // other types |
---|
[b42ab6] | 410 | for ( @joni=size(@marie); @joni>2; @joni-- ) |
---|
[5c187b] | 411 | { |
---|
[65546eb] | 412 | if(typeof(`@marie[@joni]`)==#[1] and @marie[@joni]!="LIB" |
---|
| 413 | and typeof(`@marie[@joni]`)!="proc") |
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[b42ab6] | 414 | { kill `@marie[@joni]`; } |
---|
[5c187b] | 415 | } |
---|
| 416 | } |
---|
| 417 | } |
---|
| 418 | else |
---|
| 419 | { |
---|
[65546eb] | 420 | // kills all user-defined variables whose name or type is not #i |
---|
[b42ab6] | 421 | for ( @joni=size(@marie); @joni>2; @joni-- ) |
---|
[5c187b] | 422 | { |
---|
[a1b1dd] | 423 | if ( @marie[@joni] != "LIB" && @marie[@joni] != "Top" |
---|
| 424 | && typeof(`@marie[@joni]`) != "proc") |
---|
[5c187b] | 425 | { |
---|
| 426 | no_kill = 0; |
---|
[09f420] | 427 | for (j=2; j<= size(#); j++) |
---|
[6f2edc] | 428 | { |
---|
[b42ab6] | 429 | if (typeof(`@marie[@joni]`)==#[j] or @marie[@joni] == #[j]) |
---|
[5c187b] | 430 | { |
---|
| 431 | no_kill = 1; |
---|
| 432 | break; |
---|
| 433 | } |
---|
[6f2edc] | 434 | } |
---|
[5c187b] | 435 | if (! no_kill) |
---|
[6f2edc] | 436 | { |
---|
[b42ab6] | 437 | kill `@marie[@joni]`; |
---|
[6f2edc] | 438 | } |
---|
| 439 | } |
---|
[298d0a] | 440 | if (!defined(@joni)) break; |
---|
[5c187b] | 441 | } |
---|
| 442 | } |
---|
[6f2edc] | 443 | } |
---|
[3d124a7] | 444 | } |
---|
| 445 | example |
---|
| 446 | { "EXAMPLE:"; echo = 2; |
---|
[c860e9] | 447 | ring rtest; ideal i=x,y,z; string str="hi"; int j = 3; |
---|
| 448 | export rtest,i,str,j; //this makes the local variables global |
---|
| 449 | listvar(); |
---|
| 450 | killall("ring"); // kills all rings |
---|
| 451 | listvar(); |
---|
| 452 | killall("not", "int"); // kills all variables except int's (and procs) |
---|
| 453 | listvar(); |
---|
| 454 | killall(); // kills all vars except loaded procs |
---|
| 455 | listvar(); |
---|
[3d124a7] | 456 | } |
---|
| 457 | /////////////////////////////////////////////////////////////////////////////// |
---|
| 458 | |
---|
| 459 | proc number_e (int n) |
---|
[d2b2a7] | 460 | "USAGE: number_e(n); n integer |
---|
[b42ab6] | 461 | RETURN: Euler number e=exp(1) up to n decimal digits (no rounding) |
---|
| 462 | @* - of type string if no basering of char 0 is defined |
---|
| 463 | @* - of type number if a basering of char 0 is defined |
---|
| 464 | DISPLAY: decimal format of e if printlevel > 0 (default:printlevel=0 ) |
---|
| 465 | NOTE: procedure uses algorithm of A.H.J. Sale |
---|
[3d124a7] | 466 | EXAMPLE: example number_e; shows an example |
---|
[d2b2a7] | 467 | " |
---|
[3d124a7] | 468 | { |
---|
| 469 | int i,m,s,t; |
---|
| 470 | intvec u,e; |
---|
| 471 | u[n+2]=0; e[n+1]=0; e=e+1; |
---|
| 472 | if( defined(basering) ) |
---|
| 473 | { |
---|
| 474 | if( char(basering)==0 ) { number r=2; t=1; } |
---|
| 475 | } |
---|
| 476 | string result = "2."; |
---|
| 477 | for( i=1; i<=n+1; i=i+1 ) |
---|
| 478 | { |
---|
| 479 | e = e*10; |
---|
| 480 | for( m=n+1; m>=1; m=m-1 ) |
---|
| 481 | { |
---|
| 482 | s = e[m]+u[m+1]; |
---|
[18dd47] | 483 | u[m] = s div (m+1); |
---|
[3d124a7] | 484 | e[m] = s%(m+1); |
---|
| 485 | } |
---|
| 486 | result = result+string(u[1]); |
---|
| 487 | if( t==1 ) { r = r+number(u[1])/number(10)^i; } |
---|
| 488 | } |
---|
[c860e9] | 489 | if( t==1 ) |
---|
| 490 | { dbprint(printlevel-voice+2,"// "+result[1,n+1]); |
---|
| 491 | return(r); |
---|
| 492 | } |
---|
[3d124a7] | 493 | return(result[1,n+1]); |
---|
| 494 | } |
---|
| 495 | example |
---|
| 496 | { "EXAMPLE:"; echo = 2; |
---|
[c860e9] | 497 | number_e(30);""; |
---|
[3d124a7] | 498 | ring R = 0,t,lp; |
---|
[c860e9] | 499 | number e = number_e(30); |
---|
[3d124a7] | 500 | e; |
---|
| 501 | } |
---|
| 502 | /////////////////////////////////////////////////////////////////////////////// |
---|
| 503 | |
---|
| 504 | proc number_pi (int n) |
---|
[d2b2a7] | 505 | "USAGE: number_pi(n); n positive integer |
---|
[b42ab6] | 506 | RETURN: pi (area of unit circle) up to n decimal digits (no rounding) |
---|
| 507 | @* - of type string if no basering of char 0 is defined, |
---|
| 508 | @* - of type number, if a basering of char 0 is defined |
---|
| 509 | DISPLAY: decimal format of pi if printlevel > 0 (default:printlevel=0 ) |
---|
| 510 | NOTE: procedure uses algorithm of S. Rabinowitz |
---|
[3d124a7] | 511 | EXAMPLE: example number_pi; shows an example |
---|
[d2b2a7] | 512 | " |
---|
[3d124a7] | 513 | { |
---|
| 514 | int i,m,t,e,q,N; |
---|
| 515 | intvec r,p,B,Prelim; |
---|
| 516 | string result,prelim; |
---|
[18dd47] | 517 | N = (10*n) div 3 + 2; |
---|
[3d124a7] | 518 | p[N+1]=0; p=p+2; r=p; |
---|
| 519 | for( i=1; i<=N+1; i=i+1 ) { B[i]=2*i-1; } |
---|
| 520 | if( defined(basering) ) |
---|
| 521 | { |
---|
| 522 | if( char(basering)==0 ) { number pi; number pri; t=1; } |
---|
| 523 | } |
---|
| 524 | for( i=0; i<=n; i=i+1 ) |
---|
| 525 | { |
---|
| 526 | p = r*10; |
---|
| 527 | e = p[N+1]; |
---|
| 528 | for( m=N+1; m>=2; m=m-1 ) |
---|
| 529 | { |
---|
| 530 | r[m] = e%B[m]; |
---|
[18dd47] | 531 | q = e div B[m]; |
---|
[3d124a7] | 532 | e = q*(m-1)+p[m-1]; |
---|
| 533 | } |
---|
| 534 | r[1] = e%10; |
---|
[18dd47] | 535 | q = e div 10; |
---|
[3d124a7] | 536 | if( q!=10 and q!=9 ) |
---|
| 537 | { |
---|
| 538 | result = result+prelim; |
---|
| 539 | Prelim = q; |
---|
| 540 | prelim = string(q); |
---|
| 541 | } |
---|
| 542 | if( q==9 ) |
---|
| 543 | { |
---|
| 544 | Prelim = Prelim,9; |
---|
| 545 | prelim = prelim+"9"; |
---|
| 546 | } |
---|
| 547 | if( q==10 ) |
---|
| 548 | { |
---|
[18dd47] | 549 | Prelim = (Prelim+1)-((Prelim+1) div 10)*10; |
---|
[3d124a7] | 550 | for( m=size(Prelim); m>0; m=m-1) |
---|
| 551 | { |
---|
| 552 | prelim[m] = string(Prelim[m]); |
---|
| 553 | } |
---|
| 554 | result = result+prelim; |
---|
| 555 | if( t==1 ) { pi=pi+pri; } |
---|
| 556 | Prelim = 0; |
---|
| 557 | prelim = "0"; |
---|
| 558 | } |
---|
| 559 | if( t==1 ) { pi=pi+number(q)/number(10)^i; } |
---|
| 560 | } |
---|
| 561 | result = result,prelim[1]; |
---|
| 562 | result = "3."+result[2,n-1]; |
---|
[c860e9] | 563 | if( t==1 ) |
---|
| 564 | { dbprint(printlevel-voice+2,"// "+result); |
---|
| 565 | return(pi); |
---|
| 566 | } |
---|
[3d124a7] | 567 | return(result); |
---|
| 568 | } |
---|
| 569 | example |
---|
| 570 | { "EXAMPLE:"; echo = 2; |
---|
[c860e9] | 571 | number_pi(11);""; |
---|
| 572 | ring r = (real,10),t,dp; |
---|
| 573 | number pi = number_pi(11); pi; |
---|
[3d124a7] | 574 | } |
---|
| 575 | /////////////////////////////////////////////////////////////////////////////// |
---|
| 576 | |
---|
| 577 | proc primes (int n, int m) |
---|
[d2b2a7] | 578 | "USAGE: primes(n,m); n,m integers |
---|
[3d124a7] | 579 | RETURN: intvec, consisting of all primes p, prime(n)<=p<=m, in increasing |
---|
[b42ab6] | 580 | order if n<=m, resp. prime(m)<=p<=n, in decreasing order if m<n. |
---|
| 581 | NOTE: prime(n); returns the biggest prime number <= min(n,32003) |
---|
| 582 | if n>=2, else 2 |
---|
[3d124a7] | 583 | EXAMPLE: example primes; shows an example |
---|
[d2b2a7] | 584 | " |
---|
[3d124a7] | 585 | { int change; |
---|
| 586 | if ( n>m ) { change=n; n=m ; m=change; change=1; } |
---|
| 587 | int q,p = prime(m),prime(n); intvec v = q; q = q-1; |
---|
| 588 | while ( q>=p ) { q = prime(q); v = q,v; q = q-1; } |
---|
| 589 | if ( change==1 ) { v = v[size(v)..1]; } |
---|
| 590 | return(v); |
---|
| 591 | } |
---|
| 592 | example |
---|
| 593 | { "EXAMPLE:"; echo = 2; |
---|
[c860e9] | 594 | primes(50,100);""; |
---|
| 595 | intvec v = primes(37,1); v; |
---|
[3d124a7] | 596 | } |
---|
| 597 | /////////////////////////////////////////////////////////////////////////////// |
---|
| 598 | |
---|
| 599 | proc product (id, list #) |
---|
[c860e9] | 600 | "USAGE: product(id[,v]); id ideal/vector/module/matrix/intvec/intmat/list, |
---|
[b42ab6] | 601 | v intvec (default: v=1..number of entries of id) |
---|
| 602 | ASSUME: list members can be multiplied. |
---|
[65546eb] | 603 | RETURN: The product of all entries of id [with index given by v] of type |
---|
[b42ab6] | 604 | depending on the entries of id. |
---|
| 605 | NOTE: If id is not a list, id is treated as a list of polys resp. integers. |
---|
| 606 | A module m is identified with the corresponding matrix M (columns |
---|
| 607 | of M generate m). |
---|
[7708934] | 608 | @* If v is outside the range of id, we have the empty product and the |
---|
| 609 | result will be 1 (of type int). |
---|
[3d124a7] | 610 | EXAMPLE: example product; shows an example |
---|
[d2b2a7] | 611 | " |
---|
[65546eb] | 612 | { |
---|
[7708934] | 613 | //-------------------- initialization and special feature --------------------- |
---|
[c860e9] | 614 | int n,j,tt; |
---|
[65546eb] | 615 | string ty; //will become type of id |
---|
[c860e9] | 616 | list l; |
---|
[7708934] | 617 | |
---|
| 618 | // We wish to allow something like product(x(1..10)) if x(1),...,x(10) are |
---|
[65546eb] | 619 | // variables. x(1..10) is a list of polys and enters the procedure with |
---|
[7708934] | 620 | // id=x(1) and # a list with 9 polys, #[1]= x(2),...,#[9]= x(10). Hence, in |
---|
| 621 | // this case # is never empty. If an additional intvec v is given, |
---|
| 622 | // it is added to #, so we have to separate it first and make |
---|
| 623 | // the rest a list which has to be multiplied. |
---|
| 624 | |
---|
[c860e9] | 625 | int s = size(#); |
---|
| 626 | if( s!=0 ) |
---|
[65546eb] | 627 | { if ( typeof(#[s])=="intvec" or typeof(#[s])=="int") |
---|
| 628 | { |
---|
[7708934] | 629 | intvec v = #[s]; |
---|
[65546eb] | 630 | tt=1; |
---|
[7708934] | 631 | s=s-1; |
---|
[c860e9] | 632 | if ( s>0 ) { # = #[1..s]; } |
---|
| 633 | } |
---|
| 634 | } |
---|
| 635 | if ( s>0 ) |
---|
| 636 | { |
---|
[7708934] | 637 | l = list(id)+#; |
---|
| 638 | kill id; |
---|
| 639 | list id = l; //case: id = list |
---|
| 640 | ty = "list"; |
---|
| 641 | n = size(id); |
---|
[c860e9] | 642 | } |
---|
| 643 | else |
---|
[65546eb] | 644 | { |
---|
[7708934] | 645 | ty = typeof(id); |
---|
[65546eb] | 646 | if( ty == "list" ) |
---|
[7708934] | 647 | { n = size(id); } |
---|
[c860e9] | 648 | } |
---|
[7708934] | 649 | //------------------------------ reduce to 3 cases --------------------------- |
---|
[c860e9] | 650 | if( ty=="poly" or ty=="ideal" or ty=="vector" |
---|
| 651 | or ty=="module" or ty=="matrix" ) |
---|
[3d124a7] | 652 | { |
---|
| 653 | ideal i = ideal(matrix(id)); |
---|
[c860e9] | 654 | kill id; |
---|
[7708934] | 655 | ideal id = i; //case: id = ideal |
---|
| 656 | n = ncols(id); |
---|
[3d124a7] | 657 | } |
---|
[c860e9] | 658 | if( ty=="int" or ty=="intvec" or ty=="intmat" ) |
---|
[3d124a7] | 659 | { |
---|
[c860e9] | 660 | if ( ty == "int" ) { intmat S =id; } |
---|
[3d124a7] | 661 | else { intmat S = intmat(id); } |
---|
| 662 | intvec i = S[1..nrows(S),1..ncols(S)]; |
---|
[c860e9] | 663 | kill id; |
---|
[7708934] | 664 | intvec id = i; //case: id = intvec |
---|
[65546eb] | 665 | n = size(id); |
---|
[7708934] | 666 | } |
---|
| 667 | //--------------- consider intvec v and empty product ----------------------- |
---|
[65546eb] | 668 | if( tt!=0 ) |
---|
[7708934] | 669 | { |
---|
| 670 | for (j=1; j<=size(v); j++) |
---|
| 671 | { |
---|
| 672 | if ( v[j] <= 0 or v[j] > n ) //v outside range of id |
---|
[65546eb] | 673 | { |
---|
[7708934] | 674 | return(1); //empty product is 1 |
---|
[65546eb] | 675 | } |
---|
[7708934] | 676 | } |
---|
| 677 | id = id[v]; //consider part of id |
---|
| 678 | } //corresponding to v |
---|
| 679 | //--------------------- special case: one factor is zero --------------------- |
---|
| 680 | if ( typeof(id) == "ideal") |
---|
| 681 | { |
---|
| 682 | if( size(id) < ncols(id) ) |
---|
| 683 | { |
---|
| 684 | poly f; return(f); |
---|
| 685 | } |
---|
[3d124a7] | 686 | } |
---|
[7708934] | 687 | //-------------------------- finally, multiply objects ----------------------- |
---|
[65546eb] | 688 | n = size(id); |
---|
[7708934] | 689 | def f(1) = id[1]; |
---|
[c860e9] | 690 | for( j=2; j<=n; j=j+1 ) { def f(j)=f(j-1)*id[j]; } |
---|
| 691 | return(f(n)); |
---|
[3d124a7] | 692 | } |
---|
| 693 | example |
---|
| 694 | { "EXAMPLE:"; echo = 2; |
---|
| 695 | ring r= 0,(x,y,z),dp; |
---|
| 696 | ideal m = maxideal(1); |
---|
| 697 | product(m); |
---|
[c860e9] | 698 | product(m[2..3]); |
---|
[3d124a7] | 699 | matrix M[2][3] = 1,x,2,y,3,z; |
---|
| 700 | product(M); |
---|
| 701 | intvec v=2,4,6; |
---|
| 702 | product(M,v); |
---|
| 703 | intvec iv = 1,2,3,4,5,6,7,8,9; |
---|
| 704 | v=1..5,7,9; |
---|
| 705 | product(iv,v); |
---|
| 706 | intmat A[2][3] = 1,1,1,2,2,2; |
---|
| 707 | product(A,3..5); |
---|
| 708 | } |
---|
| 709 | /////////////////////////////////////////////////////////////////////////////// |
---|
| 710 | |
---|
| 711 | proc sort (id, list #) |
---|
[a7a00b] | 712 | "USAGE: sort(id[,v,o,n]); id = ideal/module/intvec/list(of intvec's or int's) |
---|
[b42ab6] | 713 | @* sort may be called with 1, 2 or 3 arguments in the following way: |
---|
[6e52cf] | 714 | @* sort(id[,v,n]); v=intvec of positive integers, n=integer, |
---|
| 715 | @* sort(id[,o,n]); o=string (any allowed ordstr of a ring), n=integer |
---|
[b42ab6] | 716 | RETURN: a list l of two elements: |
---|
| 717 | @format |
---|
| 718 | l[1]: object of same type as input but sorted in the following way: |
---|
[3d124a7] | 719 | - if id=ideal/module: generators of id are sorted w.r.t. intvec v |
---|
| 720 | (id[v[1]] becomes 1-st, id[v[2]] 2-nd element, etc.). If no v is |
---|
| 721 | present, id is sorted w.r.t. ordering o (if o is given) or w.r.t. |
---|
| 722 | actual monomial ordering (if no o is given): |
---|
[b42ab6] | 723 | NOTE: generators with SMALLER(!) leading term come FIRST |
---|
| 724 | (e.g. sort(id); sorts backwards to actual monomial ordering) |
---|
[3d124a7] | 725 | - if id=list of intvec's or int's: consider a list element, say |
---|
| 726 | id[1]=3,2,5, as exponent vector of the monomial x^3*y^2*z^5; |
---|
| 727 | the corresponding monomials are ordered w.r.t. intvec v (s.a.). |
---|
| 728 | If no v is present, the monomials are sorted w.r.t. ordering o |
---|
| 729 | (if o is given) or w.r.t. lexicographical ordering (if no o is |
---|
| 730 | given). The corresponding ordered list of exponent vectors is |
---|
| 731 | returned. |
---|
| 732 | (e.g. sort(id); sorts lexicographically, smaller int's come first) |
---|
[a30caa3] | 733 | WARNING: Since negative exponents create the 0 polynomial in |
---|
[63be42] | 734 | Singular, id should not contain negative integers: the result |
---|
[a30caa3] | 735 | might not be as expected |
---|
[3d124a7] | 736 | - if id=intvec: id is treated as list of integers |
---|
| 737 | - if n!=0 the ordering is inverse, i.e. w.r.t. v(size(v)..1) |
---|
| 738 | default: n=0 |
---|
[b42ab6] | 739 | l[2]: intvec, describing the permutation of the input (hence l[2]=v |
---|
| 740 | if v is given (with positive integers)) |
---|
| 741 | @end format |
---|
[63be42] | 742 | NOTE: If v is given id may be any simply indexed object (e.g. any list or |
---|
| 743 | string); if v[i]<0 and i<=size(id) v[i] is set internally to i; |
---|
[3d124a7] | 744 | entries of v must be pairwise distinct to get a permutation if id. |
---|
| 745 | Zero generators of ideal/module are deleted |
---|
| 746 | EXAMPLE: example sort; shows an example |
---|
[d2b2a7] | 747 | " |
---|
[c860e9] | 748 | { int ii,jj,s,n = 0,0,1,0; |
---|
[3d124a7] | 749 | intvec v; |
---|
| 750 | if ( defined(basering) ) { def P = basering; } |
---|
[b5726c] | 751 | if ( size(#)==0 and (typeof(id)=="ideal" or typeof(id)=="module" |
---|
| 752 | or typeof(id)=="matrix")) |
---|
[3d124a7] | 753 | { |
---|
| 754 | id = simplify(id,2); |
---|
[558209] | 755 | for ( ii=1; ii<ncols(id); ii++ ) |
---|
[3d124a7] | 756 | { |
---|
| 757 | if ( id[ii]!=id[ii+1] ) { break;} |
---|
| 758 | } |
---|
[558209] | 759 | if ( ii != ncols(id) ) { v = sortvec(id); } |
---|
| 760 | else { v = ncols(id)..1; } |
---|
[3d124a7] | 761 | } |
---|
[b5726c] | 762 | if ( size(#)>=1 and (typeof(id)=="ideal" or typeof(id)=="module" |
---|
| 763 | or typeof(id)=="matrix") ) |
---|
[3d124a7] | 764 | { |
---|
| 765 | if ( typeof(#[1])=="string" ) |
---|
| 766 | { |
---|
[034ce1] | 767 | execute("ring r1 =("+charstr(P)+"),("+varstr(P)+"),("+#[1]+");"); |
---|
[3d124a7] | 768 | def i = imap(P,id); |
---|
| 769 | v = sortvec(i); |
---|
| 770 | setring P; |
---|
| 771 | n=2; |
---|
| 772 | } |
---|
| 773 | } |
---|
| 774 | if ( typeof(id)=="intvec" or typeof(id)=="list" and n==0 ) |
---|
| 775 | { |
---|
| 776 | string o; |
---|
| 777 | if ( size(#)==0 ) { o = "lp"; n=1; } |
---|
| 778 | if ( size(#)>=1 ) |
---|
| 779 | { |
---|
| 780 | if ( typeof(#[1])=="string" ) { o = #[1]; n=1; } |
---|
| 781 | } |
---|
| 782 | } |
---|
| 783 | if ( typeof(id)=="intvec" or typeof(id)=="list" and n==1 ) |
---|
| 784 | { |
---|
| 785 | if ( typeof(id)=="list" ) |
---|
| 786 | { |
---|
| 787 | for (ii=1; ii<=size(id); ii++) |
---|
| 788 | { |
---|
| 789 | if (typeof(id[ii]) != "intvec" and typeof(id[ii]) != "int") |
---|
[bea07f] | 790 | { ERROR("// list elements must be intvec/int"); } |
---|
[3d124a7] | 791 | else |
---|
| 792 | { s=size(id[ii])*(s < size(id[ii])) + s*(s >= size(id[ii])); } |
---|
| 793 | } |
---|
| 794 | } |
---|
[034ce1] | 795 | execute("ring r=0,x(1..s),("+o+");"); |
---|
[3d124a7] | 796 | ideal i; |
---|
| 797 | poly f; |
---|
| 798 | for (ii=1; ii<=size(id); ii++) |
---|
| 799 | { |
---|
| 800 | f=1; |
---|
| 801 | for (jj=1; jj<=size(id[ii]); jj++) |
---|
| 802 | { |
---|
| 803 | f=f*x(jj)^(id[ii])[jj]; |
---|
| 804 | } |
---|
| 805 | i[ii]=f; |
---|
| 806 | } |
---|
| 807 | v = sort(i)[2]; |
---|
| 808 | } |
---|
| 809 | if ( size(#)!=0 and n==0 ) { v = #[1]; } |
---|
| 810 | if( size(#)==2 ) |
---|
| 811 | { |
---|
| 812 | if ( #[2] != 0 ) { v = v[size(v)..1]; } |
---|
| 813 | } |
---|
| 814 | s = size(v); |
---|
[63be42] | 815 | if( size(id) < s ) { s = size(id); } |
---|
[3d124a7] | 816 | def m = id; |
---|
[63be42] | 817 | if ( size(m) != 0 ) |
---|
| 818 | { |
---|
[558209] | 819 | for ( jj=1; jj<=s; jj++) |
---|
[63be42] | 820 | { |
---|
| 821 | if ( v[jj]<=0 ) { v[jj]=jj; } |
---|
| 822 | m[jj] = id[v[jj]]; |
---|
| 823 | } |
---|
| 824 | } |
---|
| 825 | if ( v == 0 ) { v = 1; } |
---|
[3d124a7] | 826 | list L=m,v; |
---|
| 827 | return(L); |
---|
| 828 | } |
---|
| 829 | example |
---|
| 830 | { "EXAMPLE:"; echo = 2; |
---|
[c860e9] | 831 | ring r0 = 0,(x,y,z,t),lp; |
---|
| 832 | ideal i = x3,z3,xyz; |
---|
[584f84d] | 833 | sort(i); //sorts using lex ordering, smaller polys come first |
---|
[65546eb] | 834 | |
---|
[c860e9] | 835 | sort(i,3..1); |
---|
[b42ab6] | 836 | |
---|
[584f84d] | 837 | sort(i,"ls")[1]; //sort w.r.t. negative lex ordering |
---|
[b42ab6] | 838 | |
---|
| 839 | intvec v =1,10..5,2..4;v; |
---|
[584f84d] | 840 | sort(v)[1]; // sort v lexicographically |
---|
[b42ab6] | 841 | |
---|
[584f84d] | 842 | sort(v,"Dp",1)[1]; // sort v w.r.t (total sum, reverse lex) |
---|
[3d124a7] | 843 | } |
---|
| 844 | /////////////////////////////////////////////////////////////////////////////// |
---|
[15e59a] | 845 | |
---|
[84375a] | 846 | static proc lsum (int n, list l) |
---|
[15e59a] | 847 | { if (n>10) |
---|
| 848 | { return( lsum(n/2,list(l[1..(n/2)])) + lsum(n-n/2, list(l[(n/2+1)..n])) ); |
---|
| 849 | } |
---|
| 850 | else |
---|
| 851 | { def Summe=l[1]; |
---|
| 852 | for (int i=2;i<=n;i++) |
---|
| 853 | { Summe=Summe+l[i]; |
---|
| 854 | } |
---|
| 855 | return(Summe); |
---|
| 856 | } |
---|
| 857 | } |
---|
| 858 | |
---|
| 859 | /////////////////////////////////////////////////////////////////////////////// |
---|
| 860 | |
---|
[3d124a7] | 861 | proc sum (id, list #) |
---|
[b42ab6] | 862 | "USAGE: sum(id[,v]); id ideal/vector/module/matrix/intvec/intmat/list, |
---|
| 863 | v intvec (default: v=1..number of entries of id) |
---|
| 864 | ASSUME: list members can be added. |
---|
[65546eb] | 865 | RETURN: The sum of all entries of id [with index given by v] of type |
---|
[b42ab6] | 866 | depending on the entries of id. |
---|
[7708934] | 867 | NOTE: If id is not a list, id is treated as a list of polys resp. integers. |
---|
[b42ab6] | 868 | A module m is identified with the corresponding matrix M (columns |
---|
| 869 | of M generate m). |
---|
[7708934] | 870 | @* If v is outside the range of id, we have the empty sum and the |
---|
| 871 | result will be 0 (of type int). |
---|
[3d124a7] | 872 | EXAMPLE: example sum; shows an example |
---|
[d2b2a7] | 873 | " |
---|
[3d124a7] | 874 | { |
---|
[7708934] | 875 | //-------------------- initialization and special feature --------------------- |
---|
[b42ab6] | 876 | int n,j,tt; |
---|
[7708934] | 877 | string ty; // will become type of id |
---|
[b42ab6] | 878 | list l; |
---|
[7708934] | 879 | |
---|
| 880 | // We wish to allow something like sum(x(1..10)) if x(1),...,x(10) are |
---|
[65546eb] | 881 | // variables. x(1..10) is a list of polys and enters the procedure with |
---|
[7708934] | 882 | // id=x(1) and # a list with 9 polys, #[1]= x(2),...,#[9]= x(10). Hence, in |
---|
| 883 | // this case # is never empty. If an additional intvec v is given, |
---|
| 884 | // it is added to #, so we have to separate it first and make |
---|
| 885 | // the rest a list which has to be added. |
---|
| 886 | |
---|
[b42ab6] | 887 | int s = size(#); |
---|
| 888 | if( s!=0 ) |
---|
[7708934] | 889 | { if ( typeof(#[s])=="intvec" or typeof(#[s])=="int") |
---|
[b42ab6] | 890 | { intvec v = #[s]; |
---|
[65546eb] | 891 | tt=1; |
---|
[7708934] | 892 | s=s-1; |
---|
[b42ab6] | 893 | if ( s>0 ) { # = #[1..s]; } |
---|
| 894 | } |
---|
| 895 | } |
---|
| 896 | if ( s>0 ) |
---|
| 897 | { |
---|
[7708934] | 898 | l = list(id)+#; |
---|
| 899 | kill id; |
---|
| 900 | list id = l; //case: id = list |
---|
| 901 | ty = "list"; |
---|
[b42ab6] | 902 | } |
---|
| 903 | else |
---|
[65546eb] | 904 | { |
---|
[7708934] | 905 | ty = typeof(id); |
---|
[b42ab6] | 906 | } |
---|
[7708934] | 907 | //------------------------------ reduce to 3 cases --------------------------- |
---|
[b42ab6] | 908 | if( ty=="poly" or ty=="ideal" or ty=="vector" |
---|
| 909 | or ty=="module" or ty=="matrix" ) |
---|
[7708934] | 910 | { //case: id = ideal |
---|
[3d124a7] | 911 | ideal i = ideal(matrix(id)); |
---|
[b42ab6] | 912 | kill id; |
---|
[7708934] | 913 | ideal id = simplify(i,2); //delete 0 entries |
---|
[3d124a7] | 914 | } |
---|
[b42ab6] | 915 | if( ty=="int" or ty=="intvec" or ty=="intmat" ) |
---|
[15e59a] | 916 | { //case: id = intvec |
---|
[b42ab6] | 917 | if ( ty == "int" ) { intmat S =id; } |
---|
[3d124a7] | 918 | else { intmat S = intmat(id); } |
---|
| 919 | intvec i = S[1..nrows(S),1..ncols(S)]; |
---|
[b42ab6] | 920 | kill id; |
---|
[15e59a] | 921 | intvec id = i; |
---|
[3d124a7] | 922 | } |
---|
[7708934] | 923 | //------------------- consider intvec v and empty sum ----------------------- |
---|
[65546eb] | 924 | if( tt!=0 ) |
---|
[7708934] | 925 | { |
---|
| 926 | for (j=1; j<=size(v); j++) |
---|
| 927 | { |
---|
| 928 | if ( v[j] <= 0 or v[j] > size(id) ) //v outside range of id |
---|
[65546eb] | 929 | { |
---|
[7708934] | 930 | return(0); //empty sum is 0 |
---|
[65546eb] | 931 | } |
---|
[7708934] | 932 | } |
---|
| 933 | id = id[v]; //consider part of id |
---|
| 934 | } //corresponding to v |
---|
| 935 | |
---|
| 936 | //-------------------------- finally, add objects --------------------------- |
---|
[65546eb] | 937 | n = size(id); |
---|
[15e59a] | 938 | if (n>10) |
---|
| 939 | { return( lsum(n/2,list(id[1..(n/2)])) + lsum(n-n/2, list(id[(n/2+1)..n])) ); |
---|
| 940 | } |
---|
| 941 | else |
---|
| 942 | { def Summe=id[1]; |
---|
| 943 | for (int lauf=2;lauf<=n;lauf++) |
---|
| 944 | { Summe=Summe+id[lauf]; |
---|
| 945 | } |
---|
| 946 | return(Summe); |
---|
| 947 | } |
---|
[b42ab6] | 948 | } |
---|
[3d124a7] | 949 | example |
---|
| 950 | { "EXAMPLE:"; echo = 2; |
---|
[15e59a] | 951 | ring r1 = 0,(x,y,z),dp; |
---|
[3d124a7] | 952 | vector pv = [xy,xz,yz,x2,y2,z2]; |
---|
| 953 | sum(pv); |
---|
[c860e9] | 954 | sum(pv,2..5); |
---|
| 955 | matrix M[2][3] = 1,x,2,y,3,z; |
---|
| 956 | intvec w=2,4,6; |
---|
| 957 | sum(M,w); |
---|
| 958 | intvec iv = 1,2,3,4,5,6,7,8,9; |
---|
| 959 | sum(iv,2..4); |
---|
[15e59a] | 960 | iv = intvec(1..100); |
---|
| 961 | sum(iv); |
---|
| 962 | ring r2 = 0,(x(1..10)),dp; |
---|
| 963 | sum(x(3..7),intvec(1,3,5)); |
---|
[3d124a7] | 964 | } |
---|
| 965 | /////////////////////////////////////////////////////////////////////////////// |
---|
[6f2edc] | 966 | |
---|
[15e59a] | 967 | |
---|
| 968 | /////////////////////////////////////////////////////////////////////////////// |
---|
| 969 | |
---|
[6f2edc] | 970 | proc which (command) |
---|
[d2b2a7] | 971 | "USAGE: which(command); command = string expression |
---|
[6f2edc] | 972 | RETURN: Absolute pathname of command, if found in search path. |
---|
| 973 | Empty string, otherwise. |
---|
| 974 | NOTE: Based on the Unix command 'which'. |
---|
| 975 | EXAMPLE: example which; shows an example |
---|
[d2b2a7] | 976 | " |
---|
[6f2edc] | 977 | { |
---|
| 978 | int rs; |
---|
| 979 | int i; |
---|
[a70441f] | 980 | string fn = "which_" + string(system("pid")); |
---|
[6f2edc] | 981 | string pn; |
---|
[a70441f] | 982 | string cmd; |
---|
[82716e] | 983 | if( typeof(command) != "string") |
---|
[6f2edc] | 984 | { |
---|
[82716e] | 985 | return (pn); |
---|
[6f2edc] | 986 | } |
---|
[a70441f] | 987 | if (system("uname") != "ix86-Win") |
---|
| 988 | { |
---|
| 989 | cmd = "which "; |
---|
| 990 | } |
---|
| 991 | else |
---|
| 992 | { |
---|
| 993 | // unfortunately, it does not take -path |
---|
| 994 | cmd = "type "; |
---|
| 995 | } |
---|
| 996 | i = system("sh", cmd + command + " > " + fn); |
---|
[6f2edc] | 997 | pn = read(fn); |
---|
[a70441f] | 998 | if (system("uname") != "ix86-Win") |
---|
| 999 | { |
---|
| 1000 | // TBC: Hmm... should parse output to get rid of 'command is ' |
---|
| 1001 | pn[size(pn)] = ""; |
---|
| 1002 | i = 1; |
---|
| 1003 | while ((pn[i] != " ") and (pn[i] != "")) |
---|
| 1004 | { |
---|
| 1005 | i = i+1; |
---|
| 1006 | } |
---|
| 1007 | if (pn[i] == " ") {pn[i] = "";} |
---|
| 1008 | rs = system("sh", "ls " + pn + " > " + fn + " 2>&1 "); |
---|
| 1009 | } |
---|
| 1010 | else |
---|
[6f2edc] | 1011 | { |
---|
[a70441f] | 1012 | rs = 0; |
---|
[6f2edc] | 1013 | } |
---|
| 1014 | i = system("sh", "rm " + fn); |
---|
| 1015 | if (rs == 0) {return (pn);} |
---|
[82716e] | 1016 | else |
---|
[6f2edc] | 1017 | { |
---|
| 1018 | print (command + " not found "); |
---|
| 1019 | return (""); |
---|
| 1020 | } |
---|
| 1021 | } |
---|
| 1022 | example |
---|
| 1023 | { "EXAMPLE:"; echo = 2; |
---|
[a70441f] | 1024 | which("sh"); |
---|
[6f2edc] | 1025 | } |
---|
| 1026 | /////////////////////////////////////////////////////////////////////////////// |
---|
[ebbe4a] | 1027 | |
---|
| 1028 | proc watchdog(int i, string cmd) |
---|
[a7a00b] | 1029 | "USAGE: watchdog(i,cmd); i integer, cmd string |
---|
[b42ab6] | 1030 | RETURN: Result of cmd, if the result can be computed in i seconds. |
---|
| 1031 | Otherwise the computation is interrupted after i seconds, |
---|
| 1032 | the string "Killed" is returned and the global variable |
---|
| 1033 | 'watchdog_interrupt' is defined. |
---|
[65546eb] | 1034 | NOTE: * the MP package must be enabled |
---|
| 1035 | * the current basering should not be watchdog_rneu, since |
---|
[b42ab6] | 1036 | watchdog_rneu will be killed |
---|
[ebbe4a] | 1037 | * if there are variable names of the structure x(i) all |
---|
| 1038 | polynomials have to be put into eval(...) in order to be |
---|
| 1039 | interpreted correctly |
---|
| 1040 | * a second Singular process is started by this procedure |
---|
| 1041 | EXAMPLE: example watchdog; shows an example |
---|
| 1042 | " |
---|
| 1043 | { |
---|
| 1044 | string rname=nameof(basering); |
---|
[17ee4f] | 1045 | def rsave=basering; |
---|
[ebbe4a] | 1046 | if (defined(watchdog_rneu)) |
---|
| 1047 | { |
---|
| 1048 | kill watchdog_rneu; |
---|
| 1049 | } |
---|
| 1050 | // If we do not have MP-links, watchdog cannot be used |
---|
| 1051 | if (system("with","MP")) |
---|
| 1052 | { |
---|
| 1053 | if ( i > 0 ) |
---|
| 1054 | { |
---|
| 1055 | int j=10; |
---|
| 1056 | int k=999999; |
---|
[65546eb] | 1057 | // fork, get the pid of the child and send it the command |
---|
[ebbe4a] | 1058 | link l_fork="MPtcp:fork"; |
---|
| 1059 | open(l_fork); |
---|
| 1060 | write(l_fork,quote(system("pid"))); |
---|
| 1061 | int pid=read(l_fork); |
---|
| 1062 | execute("write(l_fork,quote(" + cmd + "));"); |
---|
| 1063 | |
---|
| 1064 | |
---|
| 1065 | // sleep in small, but growing intervals for appr. 1 second |
---|
| 1066 | while(j < k) |
---|
| 1067 | { |
---|
| 1068 | if (status(l_fork, "read", "ready", j)) {break;} |
---|
| 1069 | j = j + j; |
---|
| 1070 | } |
---|
| 1071 | |
---|
| 1072 | // sleep in intervals of one second |
---|
| 1073 | j = 1; |
---|
| 1074 | if (!status(l_fork,"read","ready")) |
---|
| 1075 | { |
---|
| 1076 | while (j < i) |
---|
| 1077 | { |
---|
| 1078 | if (status(l_fork, "read", "ready", k)) {break;} |
---|
| 1079 | j = j + 1; |
---|
| 1080 | } |
---|
| 1081 | } |
---|
| 1082 | // check, whether we have a result, and return it |
---|
| 1083 | if (status(l_fork, "read", "ready")) |
---|
| 1084 | { |
---|
| 1085 | def result = read(l_fork); |
---|
| 1086 | if (nameof(basering)!=rname) |
---|
| 1087 | { |
---|
| 1088 | def watchdog_rneu=basering; |
---|
[17ee4f] | 1089 | setring rsave; |
---|
| 1090 | if (!defined(result)) |
---|
| 1091 | { |
---|
| 1092 | def result=fetch(watchdog_rneu,result); |
---|
| 1093 | } |
---|
[ebbe4a] | 1094 | } |
---|
| 1095 | if(defined(watchdog_interrupt)) |
---|
| 1096 | { |
---|
[3b77465] | 1097 | kill watchdog_interrupt; |
---|
[ebbe4a] | 1098 | } |
---|
| 1099 | close(l_fork); |
---|
| 1100 | } |
---|
| 1101 | else |
---|
| 1102 | { |
---|
| 1103 | string result="Killed"; |
---|
| 1104 | if(!defined(watchdog_interrupt)) |
---|
| 1105 | { |
---|
| 1106 | int watchdog_interrupt=1; |
---|
| 1107 | export watchdog_interrupt; |
---|
| 1108 | } |
---|
| 1109 | close(l_fork); |
---|
| 1110 | j = system("sh","kill " + string(pid)); |
---|
| 1111 | } |
---|
| 1112 | return(result); |
---|
| 1113 | } |
---|
| 1114 | else |
---|
| 1115 | { |
---|
| 1116 | ERROR("First argument of watchdog has to be a positive integer."); |
---|
| 1117 | } |
---|
[50cbdc] | 1118 | } |
---|
| 1119 | else |
---|
| 1120 | { |
---|
[ebbe4a] | 1121 | ERROR("MP-support is not enabled in this version of Singular."); |
---|
[65546eb] | 1122 | } |
---|
[ebbe4a] | 1123 | } |
---|
| 1124 | example |
---|
| 1125 | { "EXAMPLE:"; echo=2; |
---|
| 1126 | ring r=0,(x,y,z),dp; |
---|
| 1127 | poly f=x^30+y^30; |
---|
| 1128 | watchdog(1,"factorize(eval("+string(f)+"))"); |
---|
| 1129 | watchdog(100,"factorize(eval("+string(f)+"))"); |
---|
| 1130 | } |
---|
| 1131 | /////////////////////////////////////////////////////////////////////////////// |
---|
| 1132 | |
---|
| 1133 | proc deleteSublist(intvec v,list l) |
---|
[803c5a1] | 1134 | "USAGE: deleteSublist(v,l); intvec v; list l |
---|
[ebbe4a] | 1135 | where the entries of the integer vector v correspond to the |
---|
| 1136 | positions of the elements to be deleted |
---|
| 1137 | RETURN: list without the deleted elements |
---|
| 1138 | EXAMPLE: example deleteSublist; shows an example" |
---|
| 1139 | { |
---|
| 1140 | list k; |
---|
| 1141 | int i,j,skip; |
---|
| 1142 | j=1; |
---|
| 1143 | skip=0; |
---|
| 1144 | intvec vs=sort(v)[1]; |
---|
| 1145 | for ( i=1 ; i <=size(vs) ; i++) |
---|
| 1146 | { |
---|
| 1147 | while ((j+skip) < vs[i]) |
---|
| 1148 | { |
---|
| 1149 | k[j] = l[j+skip]; |
---|
| 1150 | j++; |
---|
| 1151 | } |
---|
| 1152 | skip++; |
---|
| 1153 | } |
---|
| 1154 | if(vs[size(vs)]<size(l)) |
---|
| 1155 | { |
---|
| 1156 | k=k+list(l[(vs[size(vs)]+1)..size(l)]); |
---|
| 1157 | } |
---|
| 1158 | return(k); |
---|
| 1159 | } |
---|
| 1160 | example |
---|
| 1161 | { "EXAMPLE:"; echo=2; |
---|
| 1162 | list l=1,2,3,4,5; |
---|
| 1163 | intvec v=1,3,4; |
---|
| 1164 | l=deleteSublist(v,l); |
---|
| 1165 | l; |
---|
| 1166 | } |
---|
| 1167 | /////////////////////////////////////////////////////////////////////////////// |
---|
[8b87364] | 1168 | proc primefactors (n, list #) |
---|
| 1169 | "USAGE: primefactors(n [,p]); n = int or number, p = integer |
---|
| 1170 | COMPUTE: primefactors <= min(p,32003) of n (default p = 32003) |
---|
[298d0a] | 1171 | RETURN: a list, say l, |
---|
| 1172 | l[1] : primefactors <= min(p,32003) of n |
---|
[8b87364] | 1173 | l[2] : l[2][i] = multiplicity of l[1][i] |
---|
| 1174 | l[3] : remaining factor ( n=product{ (l[1][i]^l[2][i])*l[3]} ) |
---|
| 1175 | type(l[3])=typeof(n) |
---|
| 1176 | NOTE: If n is a long integer (of type number) then the procedure |
---|
[a7a00b] | 1177 | finds primefactors <= min(p,32003) but n may as larger as |
---|
[8b87364] | 1178 | 2147483647 (max. integer representation) |
---|
| 1179 | WARNING: the procedure works for small integers only, just by testing all |
---|
| 1180 | primes (not to be considerd as serious prime factorization!) |
---|
| 1181 | EXAMPLE: example primefactors; shows an example |
---|
| 1182 | " |
---|
| 1183 | { |
---|
| 1184 | int ii,jj,z,p,num,w3,q; |
---|
| 1185 | intvec w1,w2,v; |
---|
| 1186 | list l; |
---|
[298d0a] | 1187 | if (size(#) == 0) |
---|
[8b87364] | 1188 | { |
---|
[298d0a] | 1189 | p=32003; |
---|
[8b87364] | 1190 | } |
---|
[298d0a] | 1191 | else |
---|
[8b87364] | 1192 | { |
---|
| 1193 | if( typeof(#[1]) != "int") |
---|
| 1194 | { |
---|
| 1195 | ERROR("2nd parameter must be of type int"+newline); |
---|
| 1196 | } |
---|
| 1197 | p=#[1]; |
---|
| 1198 | } |
---|
| 1199 | if( n<0) { n=-n;}; |
---|
| 1200 | |
---|
[298d0a] | 1201 | // ----------------- case: 1st parameter is a number -------------------- |
---|
[8b87364] | 1202 | if (typeof(n) =="number") |
---|
| 1203 | { |
---|
| 1204 | kill w3; |
---|
| 1205 | number w3; |
---|
| 1206 | if( n > 2147483647 ) //2147483647 max. integer representation |
---|
| 1207 | { |
---|
| 1208 | v = primes(2,p); |
---|
| 1209 | number m; |
---|
| 1210 | for( ii=1; ii<=size(v); ii++) |
---|
[298d0a] | 1211 | { |
---|
[8b87364] | 1212 | jj=0; |
---|
| 1213 | while(1) |
---|
[298d0a] | 1214 | { |
---|
[8b87364] | 1215 | q = v[ii]; |
---|
[298d0a] | 1216 | jj = jj+1; |
---|
[8b87364] | 1217 | m = n/q; //divide n as often as possible |
---|
| 1218 | if (denominator(m)!=1) { break; } |
---|
| 1219 | n=m; |
---|
| 1220 | } |
---|
[298d0a] | 1221 | if( jj>1 ) |
---|
[8b87364] | 1222 | { |
---|
| 1223 | w1 = w1,v[ii]; //primes |
---|
| 1224 | w2 = w2,jj-1; //powers |
---|
| 1225 | } |
---|
| 1226 | if( n <= 2147483647 ) { break; } |
---|
| 1227 | } |
---|
| 1228 | } |
---|
| 1229 | |
---|
| 1230 | if( n > 2147483647 ) //n is still too big |
---|
| 1231 | { |
---|
| 1232 | if( size(w1) >1 ) //at least 1 primefactor was found |
---|
| 1233 | { |
---|
| 1234 | w1 = w1[2..size(w1)]; |
---|
| 1235 | w2 = w2[2..size(w2)]; |
---|
[298d0a] | 1236 | } |
---|
[8b87364] | 1237 | else //no primefactor was found |
---|
| 1238 | { |
---|
| 1239 | w1 = 1; w2 = 1; |
---|
[298d0a] | 1240 | } |
---|
[8b87364] | 1241 | l = w1,w2,n; |
---|
| 1242 | return(l); |
---|
| 1243 | } |
---|
| 1244 | |
---|
| 1245 | if( n <= 2147483647 ) //n is in inter range |
---|
| 1246 | { |
---|
| 1247 | num = int(n); |
---|
| 1248 | kill n; |
---|
| 1249 | int n = num; |
---|
| 1250 | } |
---|
| 1251 | } |
---|
[298d0a] | 1252 | |
---|
[8b87364] | 1253 | // --------------------------- trivial cases -------------------- |
---|
[298d0a] | 1254 | if( n==0 ) |
---|
| 1255 | { |
---|
[8b87364] | 1256 | w1=1; w2=1; w3=0; l=w1,w2,w3; |
---|
| 1257 | return(l); |
---|
| 1258 | } |
---|
[298d0a] | 1259 | |
---|
| 1260 | if( n==1 ) |
---|
| 1261 | { |
---|
[8b87364] | 1262 | w3=1; |
---|
| 1263 | if( size(w1) >1 ) //at least 1 primefactor was found |
---|
| 1264 | { |
---|
| 1265 | w1 = w1[2..size(w1)]; |
---|
| 1266 | w2 = w2[2..size(w2)]; |
---|
[298d0a] | 1267 | } |
---|
[8b87364] | 1268 | else //no primefactor was found |
---|
| 1269 | { |
---|
| 1270 | w1 = 1; w2 = 1; |
---|
[298d0a] | 1271 | } |
---|
[8b87364] | 1272 | l=w1,w2,w3; |
---|
| 1273 | return(l); |
---|
| 1274 | } |
---|
| 1275 | if ( prime(n)==n ) //note: prime(n) <= 32003 in Singular |
---|
| 1276 | { //case n is a prime |
---|
| 1277 | if (p > n) |
---|
[298d0a] | 1278 | { |
---|
[8b87364] | 1279 | w1=w1,n; w2=w2,1; w3=1; |
---|
| 1280 | w1 = w1[2..size(w1)]; |
---|
| 1281 | w2 = w2[2..size(w2)]; |
---|
| 1282 | l=w1,w2,w3; |
---|
| 1283 | return(l); |
---|
| 1284 | } |
---|
| 1285 | else |
---|
| 1286 | { |
---|
| 1287 | w3=n; |
---|
| 1288 | if( size(w1) >1 ) //at least 1 primefactor was found |
---|
| 1289 | { |
---|
| 1290 | w1 = w1[2..size(w1)]; |
---|
| 1291 | w2 = w2[2..size(w2)]; |
---|
[298d0a] | 1292 | } |
---|
[8b87364] | 1293 | else //no primefactor was found |
---|
| 1294 | { |
---|
| 1295 | w1 = 1; w2 = 1; |
---|
[298d0a] | 1296 | } |
---|
[8b87364] | 1297 | l=w1,w2,w3; |
---|
| 1298 | return(l); |
---|
[298d0a] | 1299 | } |
---|
[8b87364] | 1300 | } |
---|
[298d0a] | 1301 | else |
---|
[8b87364] | 1302 | { |
---|
| 1303 | if ( p >= n) |
---|
| 1304 | { |
---|
| 1305 | v = primes(q,n div 2 + 1); |
---|
| 1306 | } |
---|
| 1307 | else |
---|
| 1308 | { |
---|
| 1309 | v = primes(q,p); |
---|
| 1310 | } |
---|
[298d0a] | 1311 | //------------- search for primfactors <= last entry of v ------------ |
---|
[8b87364] | 1312 | for(ii=1; ii<=size(v); ii++) |
---|
| 1313 | { |
---|
| 1314 | z=0; |
---|
| 1315 | while( (n mod v[ii]) == 0 ) |
---|
[298d0a] | 1316 | { |
---|
[8b87364] | 1317 | z=z+1; |
---|
| 1318 | n = n div v[ii]; |
---|
| 1319 | } |
---|
| 1320 | if (z!=0) |
---|
[298d0a] | 1321 | { |
---|
[8b87364] | 1322 | w1 = w1,v[ii]; //primes |
---|
| 1323 | w2 = w2,z; //multiplicities |
---|
| 1324 | } |
---|
| 1325 | } |
---|
| 1326 | } |
---|
| 1327 | //--------------- case:at least 1 primefactor was found --------------- |
---|
| 1328 | if( size(w1) >1 ) //at least 1 primefactor was found |
---|
| 1329 | { |
---|
| 1330 | w1 = w1[2..size(w1)]; |
---|
| 1331 | w2 = w2[2..size(w2)]; |
---|
[298d0a] | 1332 | } |
---|
[8b87364] | 1333 | else //no primefactor was found |
---|
| 1334 | { |
---|
| 1335 | w1 = 1; w2 = 1; |
---|
[298d0a] | 1336 | } |
---|
[8b87364] | 1337 | w3 = n; |
---|
| 1338 | l = w1,w2,w3; |
---|
| 1339 | return(l); |
---|
| 1340 | } |
---|
| 1341 | example |
---|
| 1342 | { "EXAMPLE:"; echo = 2; |
---|
| 1343 | primefactors(7*8*121); |
---|
| 1344 | ring r = 0,x,dp; |
---|
| 1345 | primefactors(123456789100); |
---|
[298d0a] | 1346 | } |
---|
[8b87364] | 1347 | |
---|
| 1348 | /////////////////////////////////////////////////////////////////////////////// |
---|
| 1349 | proc primecoeffs(J, list #) |
---|
[a7a00b] | 1350 | "USAGE: primecoeffs(J[,p]); J any type which can be converted to a matrix |
---|
[8b87364] | 1351 | e.g. ideal, matrix, vector, module, int, intvec |
---|
[a7a00b] | 1352 | p = integer |
---|
[8b87364] | 1353 | COMPUTE: primefactors <= min(p,32003) of coeffs of J (default p = 32003) |
---|
[a7a00b] | 1354 | RETURN: a list, say l, of two intvectors:@* |
---|
| 1355 | l[1] : the different primefactors of all coefficients of J@* |
---|
[8b87364] | 1356 | l[2] : the different remaining factors |
---|
| 1357 | NOTE: the procedure works for small integers only, just by testing all |
---|
[a7a00b] | 1358 | primes (not to be considered as serious prime factorization!) |
---|
[8b87364] | 1359 | EXAMPLE: example primecoeffs; shows an example |
---|
| 1360 | " |
---|
| 1361 | { |
---|
| 1362 | int q,ii,n,mark;; |
---|
[298d0a] | 1363 | if (size(#) == 0) |
---|
[8b87364] | 1364 | { |
---|
[298d0a] | 1365 | q=32003; |
---|
[8b87364] | 1366 | } |
---|
[298d0a] | 1367 | else |
---|
[8b87364] | 1368 | { |
---|
| 1369 | if( typeof(#[1]) != "int") |
---|
| 1370 | { |
---|
| 1371 | ERROR("2nd parameter must be of type int"+newline); |
---|
| 1372 | } |
---|
| 1373 | q=#[1]; |
---|
| 1374 | } |
---|
| 1375 | |
---|
| 1376 | if (defined(basering) == 0) |
---|
| 1377 | { |
---|
| 1378 | mark=1; |
---|
| 1379 | ring r = 0,x,dp; |
---|
| 1380 | } |
---|
| 1381 | def I = ideal(matrix(J)); |
---|
| 1382 | poly p = product(maxideal(1)); |
---|
[298d0a] | 1383 | matrix Coef=coef(I[1],p); |
---|
[8b87364] | 1384 | ideal id, jd, rest; |
---|
| 1385 | intvec v,re; |
---|
| 1386 | list result,l; |
---|
| 1387 | for(ii=2; ii<=ncols(I); ii++) |
---|
| 1388 | { |
---|
| 1389 | Coef=concat(Coef,coef(I[ii],p)); |
---|
| 1390 | } |
---|
| 1391 | id = Coef[2,1..ncols(Coef)]; |
---|
| 1392 | id = simplify(id,6); |
---|
[298d0a] | 1393 | for (ii=1; ii<=size(id); ii++) |
---|
| 1394 | { |
---|
| 1395 | l = primefactors(number(id[ii]),q); |
---|
[8b87364] | 1396 | jd = jd,l[1]; |
---|
| 1397 | rest = rest,l[3]; |
---|
[298d0a] | 1398 | } |
---|
[8b87364] | 1399 | jd = simplify(jd,6); |
---|
[298d0a] | 1400 | for (ii=1; ii<=size(jd); ii++) |
---|
| 1401 | { |
---|
[8b87364] | 1402 | v[ii]=int(jd[ii]); |
---|
| 1403 | } |
---|
| 1404 | v = sort(v)[1]; |
---|
| 1405 | rest = simplify(rest,6); |
---|
| 1406 | id = sort(id)[1]; |
---|
| 1407 | if (mark) |
---|
| 1408 | { |
---|
| 1409 | for (ii=1; ii<=size(rest); ii++) |
---|
| 1410 | { |
---|
| 1411 | re[ii] = int(rest[ii]); |
---|
| 1412 | } |
---|
| 1413 | result = v,re; |
---|
| 1414 | } |
---|
| 1415 | else |
---|
| 1416 | { |
---|
[298d0a] | 1417 | result = v,rest; |
---|
[8b87364] | 1418 | } |
---|
| 1419 | return(result); |
---|
| 1420 | } |
---|
| 1421 | example |
---|
| 1422 | { "EXAMPLE:"; echo = 2; |
---|
| 1423 | primecoeffs(intvec(7*8*121,7*8));""; |
---|
| 1424 | ring r = 0,(b,c,t),dp; |
---|
| 1425 | ideal I = -13b6c3t+4b5c4t,-10b4c2t-5b4ct2; |
---|
| 1426 | primecoeffs(I); |
---|
[298d0a] | 1427 | } |
---|
[8b87364] | 1428 | /////////////////////////////////////////////////////////////////////////////// |
---|
[90d772] | 1429 | proc timeFactorize(poly i,list #) |
---|
[a7a00b] | 1430 | "USAGE: timeFactorize(p,d); poly p , integer d |
---|
[3c4dcc] | 1431 | RETURN: factorize(p) if the factorization finished after d-1 |
---|
[90d772] | 1432 | seconds otherwhise f is considered to be irreducible |
---|
| 1433 | EXAMPLE: example timeFactorize; shows an example |
---|
| 1434 | " |
---|
| 1435 | { |
---|
| 1436 | def P=basering; |
---|
| 1437 | if (size(#) > 0) |
---|
| 1438 | { |
---|
| 1439 | if (system("with", "MP")) |
---|
| 1440 | { |
---|
| 1441 | if ((typeof(#[1]) == "int")&&(#[1])) |
---|
| 1442 | { |
---|
| 1443 | int wait = #[1]; |
---|
| 1444 | int j = 10; |
---|
| 1445 | |
---|
| 1446 | string bs = nameof(basering); |
---|
| 1447 | link l_fork = "MPtcp:fork"; |
---|
| 1448 | open(l_fork); |
---|
| 1449 | write(l_fork, quote(system("pid"))); |
---|
| 1450 | int pid = read(l_fork); |
---|
| 1451 | write(l_fork, quote(timeFactorize(eval(i)))); |
---|
| 1452 | |
---|
| 1453 | // sleep in small intervalls for appr. one second |
---|
| 1454 | if (wait > 0) |
---|
| 1455 | { |
---|
| 1456 | while(j < 1000000) |
---|
| 1457 | { |
---|
| 1458 | if (status(l_fork, "read", "ready", j)) {break;} |
---|
| 1459 | j = j + j; |
---|
| 1460 | } |
---|
| 1461 | } |
---|
| 1462 | |
---|
| 1463 | // sleep in intervalls of one second from now on |
---|
| 1464 | j = 1; |
---|
| 1465 | while (j < wait) |
---|
| 1466 | { |
---|
| 1467 | if (status(l_fork, "read", "ready", 1000000)) {break;} |
---|
| 1468 | j = j + 1; |
---|
| 1469 | } |
---|
| 1470 | |
---|
| 1471 | if (status(l_fork, "read", "ready")) |
---|
| 1472 | { |
---|
| 1473 | def result = read(l_fork); |
---|
| 1474 | if (bs != nameof(basering)) |
---|
| 1475 | { |
---|
| 1476 | def PP = basering; |
---|
| 1477 | setring P; |
---|
| 1478 | def result = imap(PP, result); |
---|
| 1479 | kill PP; |
---|
| 1480 | } |
---|
[3b77465] | 1481 | kill l_fork; |
---|
[90d772] | 1482 | } |
---|
| 1483 | else |
---|
| 1484 | { |
---|
| 1485 | list result; |
---|
| 1486 | intvec v=1,1; |
---|
| 1487 | result[1]=list(1,i); |
---|
| 1488 | result[2]=v; |
---|
| 1489 | j = system("sh", "kill " + string(pid)); |
---|
| 1490 | } |
---|
| 1491 | return (result); |
---|
| 1492 | } |
---|
| 1493 | } |
---|
| 1494 | } |
---|
| 1495 | return(factorH(i)); |
---|
| 1496 | } |
---|
| 1497 | example |
---|
| 1498 | { "EXAMPLE:"; echo = 2; |
---|
| 1499 | ring r=0,(x,y),dp; |
---|
| 1500 | poly p=((x2+y3)^2+xy6)*((x3+y2)^2+x10y); |
---|
| 1501 | p=p^2; |
---|
| 1502 | //timeFactorize(p,2); |
---|
| 1503 | //timeFactorize(p,20); |
---|
| 1504 | } |
---|
| 1505 | |
---|
| 1506 | proc timeStd(ideal i,list #) |
---|
| 1507 | "USAGE: timeStd(i,d), i ideal, d integer |
---|
| 1508 | RETURN: std(i) if the standard basis computation finished after |
---|
| 1509 | d-1 seconds and i otherwhise |
---|
| 1510 | EXAMPLE: example timeStd; shows an example |
---|
| 1511 | " |
---|
| 1512 | { |
---|
| 1513 | def P=basering; |
---|
| 1514 | if (size(#) > 0) |
---|
| 1515 | { |
---|
| 1516 | if (system("with", "MP")) |
---|
| 1517 | { |
---|
| 1518 | if ((typeof(#[1]) == "int")&&(#[1])) |
---|
| 1519 | { |
---|
| 1520 | int wait = #[1]; |
---|
| 1521 | int j = 10; |
---|
| 1522 | |
---|
| 1523 | string bs = nameof(basering); |
---|
| 1524 | link l_fork = "MPtcp:fork"; |
---|
| 1525 | open(l_fork); |
---|
| 1526 | write(l_fork, quote(system("pid"))); |
---|
| 1527 | int pid = read(l_fork); |
---|
| 1528 | write(l_fork, quote(timeStd(eval(i)))); |
---|
| 1529 | |
---|
| 1530 | // sleep in small intervalls for appr. one second |
---|
| 1531 | if (wait > 0) |
---|
| 1532 | { |
---|
| 1533 | while(j < 1000000) |
---|
| 1534 | { |
---|
| 1535 | if (status(l_fork, "read", "ready", j)) {break;} |
---|
| 1536 | j = j + j; |
---|
| 1537 | } |
---|
| 1538 | } |
---|
| 1539 | j = 1; |
---|
| 1540 | while (j < wait) |
---|
| 1541 | { |
---|
| 1542 | if (status(l_fork, "read", "ready", 1000000)) {break;} |
---|
| 1543 | j = j + 1; |
---|
| 1544 | } |
---|
| 1545 | if (status(l_fork, "read", "ready")) |
---|
| 1546 | { |
---|
| 1547 | def result = read(l_fork); |
---|
| 1548 | if (bs != nameof(basering)) |
---|
| 1549 | { |
---|
| 1550 | def PP = basering; |
---|
| 1551 | setring P; |
---|
| 1552 | def result = imap(PP, result); |
---|
| 1553 | kill PP; |
---|
| 1554 | } |
---|
[3b77465] | 1555 | kill l_fork; |
---|
[90d772] | 1556 | } |
---|
| 1557 | else |
---|
| 1558 | { |
---|
| 1559 | ideal result=i; |
---|
| 1560 | j = system("sh", "kill " + string(pid)); |
---|
| 1561 | } |
---|
| 1562 | return (result); |
---|
| 1563 | } |
---|
| 1564 | } |
---|
| 1565 | } |
---|
| 1566 | return(std(i)); |
---|
| 1567 | } |
---|
| 1568 | example |
---|
| 1569 | { "EXAMPLE:"; echo = 2; |
---|
| 1570 | ring r=32003,(a,b,c,d,e),dp; |
---|
| 1571 | int n=6; |
---|
| 1572 | ideal i= |
---|
| 1573 | a^n-b^n, |
---|
| 1574 | b^n-c^n, |
---|
| 1575 | c^n-d^n, |
---|
| 1576 | d^n-e^n, |
---|
| 1577 | a^(n-1)*b+b^(n-1)*c+c^(n-1)*d+d^(n-1)*e+e^(n-1)*a; |
---|
| 1578 | timeStd(i,2); |
---|
| 1579 | timeStd(i,20); |
---|
| 1580 | } |
---|
| 1581 | |
---|
| 1582 | proc factorH(poly p) |
---|
| 1583 | "USAGE: factorH(p) p poly |
---|
| 1584 | RETURN: factorize(p) |
---|
[a7a00b] | 1585 | NOTE: changes variables to make the last variable the principal |
---|
[90d772] | 1586 | one in the multivariate factorization and factorizes then |
---|
| 1587 | the polynomial |
---|
| 1588 | EXAMPLE: example factorH; shows an example |
---|
| 1589 | " |
---|
| 1590 | { |
---|
| 1591 | def R=basering; |
---|
| 1592 | int i,j; |
---|
| 1593 | int n=1; |
---|
| 1594 | int d=nrows(coeffs(p,var(1))); |
---|
| 1595 | for(i=1;i<=nvars(R);i++) |
---|
| 1596 | { |
---|
| 1597 | j=nrows(coeffs(p,var(i))); |
---|
| 1598 | if(d>j) |
---|
| 1599 | { |
---|
| 1600 | n=i; |
---|
| 1601 | d=j; |
---|
| 1602 | } |
---|
| 1603 | } |
---|
| 1604 | ideal ma=maxideal(1); //die letzte Variable ist die Hauptvariable |
---|
| 1605 | ma[nvars(R)]=var(n); |
---|
| 1606 | ma[n]=var(nvars(R)); |
---|
| 1607 | map phi=R,ma; |
---|
| 1608 | list fac=factorize(phi(p)); |
---|
| 1609 | list re=phi(fac); |
---|
| 1610 | return(re); |
---|
| 1611 | } |
---|
| 1612 | example |
---|
| 1613 | { "EXAMPLE:"; echo = 2; |
---|
| 1614 | system("random",992851144); |
---|
| 1615 | ring r=32003,(x,y,z,w,t),lp; |
---|
| 1616 | poly p=y2w9+yz7t-yz5w4-z2w4t4-w8t3; |
---|
| 1617 | factorize(p); //fast |
---|
| 1618 | system("random",992851262); |
---|
| 1619 | //factorize(p); //slow |
---|
| 1620 | system("random",992851262); |
---|
| 1621 | factorH(p); |
---|
| 1622 | } |
---|