Actual source code: ex37.c
1: /*$Id: ex37.c,v 1.22 2001/08/07 03:03:07 balay Exp $*/
3: static char help[] = "Tests MatCopy() and MatStore/RetrieveValues().nn";
5: #include petscmat.h
7: int main(int argc,char **args)
8: {
9: Mat C,A;
10: int i, n = 10,midx[3],ierr;
11: PetscScalar v[3];
12: PetscTruth flg;
14: PetscInitialize(&argc,&args,(char *)0,help);
15: PetscOptionsGetInt(PETSC_NULL,"-n",&n,PETSC_NULL);
17: MatCreate(PETSC_COMM_WORLD,PETSC_DECIDE,PETSC_DECIDE,n,n,&C);
18: MatSetFromOptions(C);
19: MatCreate(PETSC_COMM_WORLD,PETSC_DECIDE,PETSC_DECIDE,n,n,&A);
20: MatSetFromOptions(A);
22: v[0] = -1.; v[1] = 2.; v[2] = -1.;
23: for (i=1; i<n-1; i++){
24: midx[2] = i-1; midx[1] = i; midx[0] = i+1;
25: MatSetValues(C,1,&i,3,midx,v,INSERT_VALUES);
26: }
27: i = 0; midx[0] = 0; midx[1] = 1;
28: v[0] = 2.0; v[1] = -1.;
29: MatSetValues(C,1,&i,2,midx,v,INSERT_VALUES);
30: i = n-1; midx[0] = n-2; midx[1] = n-1;
31: v[0] = -1.0; v[1] = 2.;
32: MatSetValues(C,1,&i,2,midx,v,INSERT_VALUES);
34: MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY);
35: MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY);
37: /* test matrices with different nonzero patterns */
38: MatCopy(C,A,DIFFERENT_NONZERO_PATTERN);
40: /* Now C and A have the same nonzero pattern */
41: MatSetOption(C,MAT_NO_NEW_NONZERO_LOCATIONS);
42: MatSetOption(A,MAT_NO_NEW_NONZERO_LOCATIONS);
43: MatCopy(C,A,SAME_NONZERO_PATTERN);
45: MatView(C,PETSC_VIEWER_STDOUT_WORLD);
46: MatView(A,PETSC_VIEWER_STDOUT_WORLD);
48: MatEqual(A,C,&flg);
49: if (flg) {
50: PetscPrintf(PETSC_COMM_WORLD,"Matrices are equaln");
51: } else {
52: SETERRQ(1,"Matrices are NOT equal");
53: }
55: MatStoreValues(A);
56: MatZeroEntries(A);
57: MatRetrieveValues(A);
58: MatEqual(A,C,&flg);
59: if (flg) {
60: PetscPrintf(PETSC_COMM_WORLD,"Matrices are equaln");
61: } else {
62: SETERRQ(1,"Matrices are NOT equal");
63: }
65: MatDestroy(C);
66: MatDestroy(A);
68: PetscFinalize();
69: return 0;
70: }
72: