Actual source code: ex13.c
1: /*$Id: ex13.c,v 1.18 2001/08/07 03:03:07 balay Exp $*/
3: static char help[] = "Tests copying and ordering uniprocessor row-based sparse matrices.\n\n";
5: #include petscmat.h
9: int main(int argc,char **args)
10: {
11: Mat C,A;
12: int i,j,m = 5,n = 5,I,J,ierr;
13: PetscScalar v;
14: IS perm,iperm;
16: PetscInitialize(&argc,&args,(char *)0,help);
18: MatCreateSeqAIJ(PETSC_COMM_SELF,m*n,m*n,5,PETSC_NULL,&C);
20: /* create the matrix for the five point stencil, YET AGAIN*/
21: for (i=0; i<m; i++) {
22: for (j=0; j<n; j++) {
23: v = -1.0; I = j + n*i;
24: if (i>0) {J = I - n; MatSetValues(C,1,&I,1,&J,&v,INSERT_VALUES);}
25: if (i<m-1) {J = I + n; MatSetValues(C,1,&I,1,&J,&v,INSERT_VALUES);}
26: if (j>0) {J = I - 1; MatSetValues(C,1,&I,1,&J,&v,INSERT_VALUES);}
27: if (j<n-1) {J = I + 1; MatSetValues(C,1,&I,1,&J,&v,INSERT_VALUES);}
28: v = 4.0; MatSetValues(C,1,&I,1,&I,&v,INSERT_VALUES);
29: }
30: }
31: MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY);
32: MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY);
34: MatConvert(C,MATSAME,&A);
36: MatGetOrdering(A,MATORDERING_ND,&perm,&iperm);
37: ISView(perm,PETSC_VIEWER_STDOUT_SELF);
38: ISView(iperm,PETSC_VIEWER_STDOUT_SELF);
39: MatView(A,PETSC_VIEWER_STDOUT_SELF);
41: ISDestroy(perm);
42: ISDestroy(iperm);
43: MatDestroy(C);
44: MatDestroy(A);
45: PetscFinalize();
46: return 0;
47: }