spielwiese
Last change
on this file since 1ebec3 was
15bd61f,
checked in by Hans Schönemann <hannes@…>, 23 years ago
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*hannes: branch, GP corr, new Ex 7.9.6
git-svn-id: file:///usr/local/Singular/svn/trunk@5625 2c84dea3-7e68-4137-9b89-c4e89433aadc
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-
Property mode set to
100644
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File size:
962 bytes
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1 | LIB "tst.lib"; |
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2 | tst_init(); |
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3 | |
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4 | proc contraHom(matrix M,int s) |
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5 | { |
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6 | int n=ncols(M); |
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7 | int m=nrows(M); |
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8 | int a,b,c; |
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9 | matrix R[s*n][s*m]; |
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10 | for(b=1;b<=m;b++) |
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11 | { |
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12 | for(a=1;a<=s;a++) |
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13 | { |
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14 | for(c=1;c<=n;c++) |
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15 | { |
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16 | R[(a-1)*n+c,(a-1)*m+b]=M[b,c]; |
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17 | } |
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18 | } |
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19 | } |
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20 | return(R); |
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21 | } |
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22 | |
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23 | proc coHom(matrix M,int s) |
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24 | { |
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25 | int n=ncols(M); |
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26 | int m=nrows(M); |
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27 | int a,b,c; |
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28 | matrix R[s*m][s*n]; |
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29 | for(b=1;b<=s;b++) |
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30 | { |
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31 | for(a=1;a<=m;a++) |
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32 | { |
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33 | for(c=1;c<=n;c++) |
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34 | { |
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35 | R[(a-1)*s+b,(c-1)*s+b]=M[a,c]; |
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36 | } |
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37 | } |
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38 | } |
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39 | return(R); |
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40 | } |
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41 | |
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42 | proc Hom(matrix M, matrix N) |
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43 | { |
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44 | matrix A = contraHom(M,nrows(N)); |
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45 | matrix B = coHom(N,ncols(M)); |
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46 | matrix C = coHom(N,nrows(M)); |
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47 | matrix D = modulo(A,B); |
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48 | matrix E = modulo(D,C); |
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49 | return(E); |
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50 | } |
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51 | |
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52 | ring A=0,(x,y,z),dp; |
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53 | matrix M[3][3]=1,2,3, |
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54 | 4,5,6, |
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55 | 7,8,9; |
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56 | matrix N[2][2]=x,y, |
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57 | z,0; |
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58 | |
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59 | print(Hom(M,N)); |
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60 | |
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61 | |
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62 | tst_status(1);$ |
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