Actual source code: ex13.c
2: static char help[] = "Tests copying and ordering uniprocessor row-based sparse matrices.\n\n";
4: #include <petscmat.h>
6: int main(int argc,char **args)
7: {
8: Mat C,A;
9: PetscInt i,j,m = 5,n = 5,Ii,J;
10: PetscScalar v;
11: IS perm,iperm;
13: PetscInitialize(&argc,&args,(char*)0,help);
14: MatCreateSeqAIJ(PETSC_COMM_SELF,m*n,m*n,5,NULL,&C);
15: /* create the matrix for the five point stencil, YET AGAIN*/
16: for (i=0; i<m; i++) {
17: for (j=0; j<n; j++) {
18: v = -1.0; Ii = j + n*i;
19: if (i>0) {J = Ii - n; MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES);}
20: if (i<m-1) {J = Ii + n; MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES);}
21: if (j>0) {J = Ii - 1; MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES);}
22: if (j<n-1) {J = Ii + 1; MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES);}
23: v = 4.0; MatSetValues(C,1,&Ii,1,&Ii,&v,INSERT_VALUES);
24: }
25: }
26: MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY);
27: MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY);
29: MatConvert(C,MATSAME,MAT_INITIAL_MATRIX,&A);
31: MatGetOrdering(A,MATORDERINGND,&perm,&iperm);
32: ISView(perm,PETSC_VIEWER_STDOUT_SELF);
33: ISView(iperm,PETSC_VIEWER_STDOUT_SELF);
34: MatView(A,PETSC_VIEWER_STDOUT_SELF);
36: ISDestroy(&perm);
37: ISDestroy(&iperm);
38: MatDestroy(&C);
39: MatDestroy(&A);
40: PetscFinalize();
41: return 0;
42: }
44: /*TEST
46: test:
47: filter: grep -v "MPI processes"
49: TEST*/