Actual source code: ex107.c


  2: static char help[] = "Test MatCreate() with MAT_STRUCTURE_ONLY .\n\n";

  4: #include <petscmat.h>

  6: int main(int argc, char **argv)
  7: {
  8:   Mat         mat;
  9:   PetscInt    m = 7, n, i, j, rstart, rend;
 10:   PetscMPIInt size;
 11:   PetscScalar v;
 12:   PetscBool   struct_only = PETSC_TRUE;

 15:   PetscInitialize(&argc, &argv, (char *)0, help);
 16:   MPI_Comm_size(PETSC_COMM_WORLD, &size);

 19:   PetscViewerPushFormat(PETSC_VIEWER_STDOUT_WORLD, PETSC_VIEWER_ASCII_COMMON);
 20:   PetscOptionsGetInt(NULL, NULL, "-m", &m, NULL);
 21:   PetscOptionsGetBool(NULL, NULL, "-struct_only", &struct_only, NULL);
 22:   n = m;

 24:   /* ------- Assemble matrix, test MatValid() --------- */
 25:   MatCreate(PETSC_COMM_WORLD, &mat);
 26:   MatSetSizes(mat, PETSC_DECIDE, PETSC_DECIDE, m, n);
 27:   MatSetFromOptions(mat);
 28:   if (struct_only) MatSetOption(mat, MAT_STRUCTURE_ONLY, PETSC_TRUE);
 29:   MatSetUp(mat);
 30:   MatGetOwnershipRange(mat, &rstart, &rend);
 31:   for (i = rstart; i < rend; i++) {
 32:     for (j = 0; j < n; j++) {
 33:       v = 10.0 * i + j;
 34:       MatSetValues(mat, 1, &i, 1, &j, &v, INSERT_VALUES);
 35:     }
 36:   }
 37:   MatAssemblyBegin(mat, MAT_FINAL_ASSEMBLY);
 38:   MatAssemblyEnd(mat, MAT_FINAL_ASSEMBLY);
 39:   MatView(mat, PETSC_VIEWER_STDOUT_WORLD);

 41:   /* Free data structures */
 42:   MatDestroy(&mat);
 43:   PetscFinalize();
 44:   return 0;
 45: }

 47: /*TEST

 49:    test:
 50:       output_file: output/ex107.out

 52:    test:
 53:       suffix: 2
 54:       args: -mat_type baij -mat_block_size 2 -m 10

 56: TEST*/