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D.5.5.3 determinecenter

Procedure from library resbinomial.lib (see resbinomial_lib).

Usage:
determinecenter(Coef,expJ,c,n,Y,a,listmb,flag,control3,Hhist); Coef, expJ, listmb, flag lists, c number, n, Y, control3 integers, a, Hhist intvec

Compute:
next center of blowing up and related information, see example

Return:
several lists defining the center and related information

Example:
 
LIB "resbinomial.lib";
ring r = 0,(x(1..4)),dp;
list flag=identifyvar();
ideal J=x(1)^2-x(2)^2*x(3)^5, x(1)*x(3)^3+x(4)^6;
list Lmb=1,list(0,0,0,0),list(0,0,0,0),list(0,0,0,0),iniD(4),iniD(4),list(0,0,0,0),-1;
list L=data(J,2,4);
list LL=determinecenter(L[1],L[2],2,4,0,0,Lmb,flag,0,-1); // Compute the first center
LL[1];  // index of variables in the center
==> [1]:
==>    1
==> [2]:
==>    4
==> [3]:
==>    3
==> [4]:
==>    2
LL[2];  // exponents of ideals J_4,J_3,J_2,J_1
==> [1]:
==>    [1]:
==>       [1]:
==>          [1]:
==>             0
==>          [2]:
==>             2
==>          [3]:
==>             5
==>          [4]:
==>             0
==>       [2]:
==>          [1]:
==>             2
==>          [2]:
==>             0
==>          [3]:
==>             0
==>          [4]:
==>             0
==>    [2]:
==>       [1]:
==>          [1]:
==>             0
==>          [2]:
==>             0
==>          [3]:
==>             0
==>          [4]:
==>             6
==>       [2]:
==>          [1]:
==>             1
==>          [2]:
==>             0
==>          [3]:
==>             3
==>          [4]:
==>             0
==> [2]:
==>    [1]:
==>       [1]:
==>          [1]:
==>             0
==>          [2]:
==>             2
==>          [3]:
==>             5
==>          [4]:
==>             0
==>    [2]:
==>       [1]:
==>          [1]:
==>             0
==>          [2]:
==>             0
==>          [3]:
==>             0
==>          [4]:
==>             6
==>    [3]:
==>       [1]:
==>          [1]:
==>             0
==>          [2]:
==>             0
==>          [3]:
==>             6
==>          [4]:
==>             0
==> [3]:
==>    [1]:
==>       [1]:
==>          [1]:
==>             0
==>          [2]:
==>             2
==>          [3]:
==>             5
==>          [4]:
==>             0
==>    [2]:
==>       [1]:
==>          [1]:
==>             0
==>          [2]:
==>             0
==>          [3]:
==>             6
==>          [4]:
==>             0
==> [4]:
==>    [1]:
==>       [1]:
==>          [1]:
==>             0
==>          [2]:
==>             12
==>          [3]:
==>             0
==>          [4]:
==>             0
LL[3];  // list of orders of J_4,J_3,J_2,J_1
==> [1]:
==>    2
==> [2]:
==>    6
==> [3]:
==>    6
==> [4]:
==>    12
LL[4];  // list of critical values
==> [1]:
==>    2
==> [2]:
==>    2
==> [3]:
==>    6
==> [4]:
==>    6
LL[5];  // components of the resolution function t
==> [1]:
==>    1
==> [2]:
==>    3
==> [3]:
==>    1
==> [4]:
==>    2
LL[6];  // list of D_4,D_3,D_2,D_1
==> [1]:
==>    [1]:
==>       0
==>    [2]:
==>       0
==>    [3]:
==>       0
==>    [4]:
==>       0
==> [2]:
==>    [1]:
==>       0
==>    [2]:
==>       0
==>    [3]:
==>       0
==>    [4]:
==>       0
==> [3]:
==>    [1]:
==>       0
==>    [2]:
==>       0
==>    [3]:
==>       0
==>    [4]:
==>       0
==> [4]:
==>    [1]:
==>       0
==>    [2]:
==>       0
==>    [3]:
==>       0
==>    [4]:
==>       0
LL[7];  // list of H_4,H_3,H_2,H_1 (exceptional divisors)
==> [1]:
==>    [1]:
==>       0
==>    [2]:
==>       0
==>    [3]:
==>       0
==>    [4]:
==>       0
==> [2]:
==>    [1]:
==>       0
==>    [2]:
==>       0
==>    [3]:
==>       0
==>    [4]:
==>       0
==> [3]:
==>    [1]:
==>       0
==>    [2]:
==>       0
==>    [3]:
==>       0
==>    [4]:
==>       0
==> [4]:
==>    [1]:
==>       0
==>    [2]:
==>       0
==>    [3]:
==>       0
==>    [4]:
==>       0
LL[8];  // list of all exceptional divisors acumulated
==> [1]:
==>    0
==> [2]:
==>    0
==> [3]:
==>    0
==> [4]:
==>    0
LL[9];  // auxiliary invariant
==> [1]:
==>    0
LL[10]; // intvec pointing out the last step where the function t has dropped
==> -1,-1,-1,-1
ring r= 0,(x(1..4)),dp;
==> // ** redefining r **
list flag=identifyvar();
==> // ** redefining flag **
ideal J=x(1)^3-x(2)^2*x(3)^5, x(1)*x(3)^3+x(4)^5;
list Lmb=2,list(0,0,0,0),list(0,0,0,0),list(0,0,0,0),iniD(4),iniD(4),list(0,0,0,0),-1;
==> // ** redefining Lmb **
list L2=data(J,2,4);
list L3=determinecenter(L2[1],L2[2],2,4,0,0,Lmb,flag,0,-1); // Example with rational exponents in E-Coeff
L3[1]; // index of variables in the center
==> [1]:
==>    1
==> [2]:
==>    3
==> [3]:
==>    4
L3[2]; // exponents of ideals J_4,J_3,J_2,J_1
==> [1]:
==>    [1]:
==>       [1]:
==>          [1]:
==>             0
==>          [2]:
==>             2
==>          [3]:
==>             5
==>          [4]:
==>             0
==>       [2]:
==>          [1]:
==>             3
==>          [2]:
==>             0
==>          [3]:
==>             0
==>          [4]:
==>             0
==>    [2]:
==>       [1]:
==>          [1]:
==>             0
==>          [2]:
==>             0
==>          [3]:
==>             0
==>          [4]:
==>             5
==>       [2]:
==>          [1]:
==>             1
==>          [2]:
==>             0
==>          [3]:
==>             3
==>          [4]:
==>             0
==> [2]:
==>    [1]:
==>       [1]:
==>          [1]:
==>             0
==>          [2]:
==>             2
==>          [3]:
==>             5
==>          [4]:
==>             0
==>    [2]:
==>       [1]:
==>          [1]:
==>             0
==>          [2]:
==>             0
==>          [3]:
==>             0
==>          [4]:
==>             5
==>    [3]:
==>       [1]:
==>          [1]:
==>             0
==>          [2]:
==>             0
==>          [3]:
==>             9/2
==>          [4]:
==>             0
==> [3]:
==>    [1]:
==>       [1]:
==>          [1]:
==>             0
==>          [2]:
==>             0
==>          [3]:
==>             0
==>          [4]:
==>             5
==> [4]:
==>    [1]:
==>       [1]:
==>          [1]:
==>             0
==>          [2]:
==>             0
==>          [3]:
==>             0
==>          [4]:
==>             0
L3[3]; // list of orders of J_4,J_3,J_2,J_1
==> [1]:
==>    3
==> [2]:
==>    9/2
==> [3]:
==>    5
L3[4]; // list of critical values
==> [1]:
==>    2
==> [2]:
==>    3
==> [3]:
==>    9/2
L3[5]; // components of the resolution function
==> [1]:
==>    3/2
==> [2]:
==>    3/2
==> [3]:
==>    10/9


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