Actual source code: ex25.c
2: static char help[] = "Tests MatTranspose()\n\n";
4: #include petscmat.h
8: int main(int argc,char **args)
9: {
10: Mat C,A;
11: PetscScalar v;
12: PetscInt i,j,m = 4,n = 4,Ii,J,Istart,Iend;
13: PetscMPIInt rank,size;
15: PetscTruth equal=PETSC_FALSE;
17: PetscInitialize(&argc,&args,(char *)0,help);
18: MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
19: MPI_Comm_size(PETSC_COMM_WORLD,&size);
21: PetscOptionsGetInt(PETSC_NULL,"-m",&m,PETSC_NULL);
22: n = m;
23:
24: MatCreateMPIAIJ(PETSC_COMM_WORLD,PETSC_DECIDE,PETSC_DECIDE,
25: m*n,m*n,5,PETSC_NULL,5,PETSC_NULL,&C);
27: /* create the symmetric matrix for the five point stencil */
28: MatGetOwnershipRange(C,&Istart,&Iend);
29: for (Ii=Istart; Ii<Iend; Ii++) {
30: v = -1.0; i = Ii/n; j = Ii - i*n;
31: if (i>0) {J = Ii - n; MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES);}
32: if (i<m-1) {J = Ii + n; MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES);}
33: if (j>0) {J = Ii - 1; MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES);}
34: if (j<n-1) {J = Ii + 1; MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES);}
35: v = 4.0; MatSetValues(C,1,&Ii,1,&Ii,&v,INSERT_VALUES);
36: }
37: MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY);
38: MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY);
39:
40: MatTranspose(C,MAT_INITIAL_MATRIX,&A);
42: MatEqual(C,A,&equal);
43: if (!equal) SETERRQ(PETSC_ERR_SUP,"C != C^T");
45: MatDestroy(C);
46: MatDestroy(A);
47: PetscFinalize();
48: return 0;
49: }