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.nn";
5: #include petscmat.h
7: int main(int argc,char **args)
8: {
9: Mat C,A;
10: int i,j,m = 5,n = 5,I,J,ierr;
11: PetscScalar v;
12: IS perm,iperm;
14: PetscInitialize(&argc,&args,(char *)0,help);
16: MatCreateSeqAIJ(PETSC_COMM_SELF,m*n,m*n,5,PETSC_NULL,&C);
18: /* create the matrix for the five point stencil, YET AGAIN*/
19: for (i=0; i<m; i++) {
20: for (j=0; j<n; j++) {
21: v = -1.0; I = j + n*i;
22: if (i>0) {J = I - n; MatSetValues(C,1,&I,1,&J,&v,INSERT_VALUES);}
23: if (i<m-1) {J = I + n; MatSetValues(C,1,&I,1,&J,&v,INSERT_VALUES);}
24: if (j>0) {J = I - 1; MatSetValues(C,1,&I,1,&J,&v,INSERT_VALUES);}
25: if (j<n-1) {J = I + 1; MatSetValues(C,1,&I,1,&J,&v,INSERT_VALUES);}
26: v = 4.0; MatSetValues(C,1,&I,1,&I,&v,INSERT_VALUES);
27: }
28: }
29: MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY);
30: MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY);
32: MatConvert(C,MATSAME,&A);
34: MatGetOrdering(A,MATORDERING_ND,&perm,&iperm);
35: ISView(perm,PETSC_VIEWER_STDOUT_SELF);
36: ISView(iperm,PETSC_VIEWER_STDOUT_SELF);
37: MatView(A,PETSC_VIEWER_STDOUT_SELF);
39: ISDestroy(perm);
40: ISDestroy(iperm);
41: MatDestroy(C);
42: MatDestroy(A);
43: PetscFinalize();
44: return 0;
45: }