Actual source code: ex25.c
2: static char help[] = "Tests MatTranspose()\n\n";
4: #include <petscmat.h>
6: int main(int argc,char **args)
7: {
8: Mat C,A;
9: PetscScalar v;
10: PetscInt i,j,m = 4,n = 4,Ii,J,Istart,Iend;
11: PetscMPIInt rank,size;
12: PetscBool equal=PETSC_FALSE;
14: PetscInitialize(&argc,&args,(char*)0,help);
15: MPI_Comm_rank(PETSC_COMM_WORLD,&rank);
16: MPI_Comm_size(PETSC_COMM_WORLD,&size);
18: PetscOptionsGetInt(NULL,NULL,"-m",&m,NULL);
19: n = m;
21: MatCreateAIJ(PETSC_COMM_WORLD,PETSC_DECIDE,PETSC_DECIDE,m*n,m*n,5,NULL,5,NULL,&C);
23: /* create the symmetric matrix for the five point stencil */
24: MatGetOwnershipRange(C,&Istart,&Iend);
25: for (Ii=Istart; Ii<Iend; Ii++) {
26: v = -1.0; i = Ii/n; j = Ii - i*n;
27: if (i>0) {J = Ii - n; MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES);}
28: if (i<m-1) {J = Ii + n; MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES);}
29: if (j>0) {J = Ii - 1; MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES);}
30: if (j<n-1) {J = Ii + 1; MatSetValues(C,1,&Ii,1,&J,&v,INSERT_VALUES);}
31: v = 4.0; MatSetValues(C,1,&Ii,1,&Ii,&v,INSERT_VALUES);
32: }
33: MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY);
34: MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY);
36: MatTranspose(C,MAT_INITIAL_MATRIX,&A);
38: MatEqual(C,A,&equal);
41: MatDestroy(&C);
42: MatDestroy(&A);
43: PetscFinalize();
44: return 0;
45: }
47: /*TEST
49: test:
51: TEST*/