Actual source code: ex25.c

  1: static char help[] = "Tests MatTranspose()\n\n";

  3: #include <petscmat.h>

  5: int main(int argc, char **args)
  6: {
  7:   Mat         C, A;
  8:   PetscScalar v;
  9:   PetscInt    i, j, m = 4, n = 4, Ii, J, Istart, Iend;
 10:   PetscMPIInt rank, size;
 11:   PetscBool   equal = PETSC_FALSE;

 13:   PetscFunctionBeginUser;
 14:   PetscCall(PetscInitialize(&argc, &args, (char *)0, help));
 15:   PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank));
 16:   PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size));

 18:   PetscCall(PetscOptionsGetInt(NULL, NULL, "-m", &m, NULL));
 19:   n = m;

 21:   PetscCall(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:   PetscCall(MatGetOwnershipRange(C, &Istart, &Iend));
 25:   for (Ii = Istart; Ii < Iend; Ii++) {
 26:     v = -1.0;
 27:     i = Ii / n;
 28:     j = Ii - i * n;
 29:     if (i > 0) {
 30:       J = Ii - n;
 31:       PetscCall(MatSetValues(C, 1, &Ii, 1, &J, &v, INSERT_VALUES));
 32:     }
 33:     if (i < m - 1) {
 34:       J = Ii + n;
 35:       PetscCall(MatSetValues(C, 1, &Ii, 1, &J, &v, INSERT_VALUES));
 36:     }
 37:     if (j > 0) {
 38:       J = Ii - 1;
 39:       PetscCall(MatSetValues(C, 1, &Ii, 1, &J, &v, INSERT_VALUES));
 40:     }
 41:     if (j < n - 1) {
 42:       J = Ii + 1;
 43:       PetscCall(MatSetValues(C, 1, &Ii, 1, &J, &v, INSERT_VALUES));
 44:     }
 45:     v = 4.0;
 46:     PetscCall(MatSetValues(C, 1, &Ii, 1, &Ii, &v, INSERT_VALUES));
 47:   }
 48:   PetscCall(MatAssemblyBegin(C, MAT_FINAL_ASSEMBLY));
 49:   PetscCall(MatAssemblyEnd(C, MAT_FINAL_ASSEMBLY));

 51:   PetscCall(MatTranspose(C, MAT_INITIAL_MATRIX, &A));

 53:   PetscCall(MatEqual(C, A, &equal));
 54:   PetscCheck(equal, PETSC_COMM_SELF, PETSC_ERR_SUP, "C != C^T");

 56:   PetscCall(MatDestroy(&C));
 57:   PetscCall(MatDestroy(&A));
 58:   PetscCall(PetscFinalize());
 59:   return 0;
 60: }

 62: /*TEST

 64:    test:

 66: TEST*/