1 static char help[] = "Test MatCreate() with MAT_STRUCTURE_ONLY .\n\n"; 2 3 #include <petscmat.h> 4 5 int main(int argc, char **argv) 6 { 7 Mat mat; 8 PetscInt m = 7, n, i, j, rstart, rend; 9 PetscMPIInt size; 10 PetscScalar v; 11 PetscBool struct_only = PETSC_TRUE; 12 13 PetscFunctionBeginUser; 14 PetscCall(PetscInitialize(&argc, &argv, (char *)0, help)); 15 PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size)); 16 PetscCheck(size == 1, PETSC_COMM_WORLD, PETSC_ERR_WRONG_MPI_SIZE, "This is a uniprocessor example only!"); 17 18 PetscCall(PetscViewerPushFormat(PETSC_VIEWER_STDOUT_WORLD, PETSC_VIEWER_ASCII_COMMON)); 19 PetscCall(PetscOptionsGetInt(NULL, NULL, "-m", &m, NULL)); 20 PetscCall(PetscOptionsGetBool(NULL, NULL, "-struct_only", &struct_only, NULL)); 21 n = m; 22 23 /* ------- Assemble matrix, test MatValid() --------- */ 24 PetscCall(MatCreate(PETSC_COMM_WORLD, &mat)); 25 PetscCall(MatSetSizes(mat, PETSC_DECIDE, PETSC_DECIDE, m, n)); 26 PetscCall(MatSetFromOptions(mat)); 27 if (struct_only) PetscCall(MatSetOption(mat, MAT_STRUCTURE_ONLY, PETSC_TRUE)); 28 PetscCall(MatSetUp(mat)); 29 PetscCall(MatGetOwnershipRange(mat, &rstart, &rend)); 30 for (i = rstart; i < rend; i++) { 31 for (j = 0; j < n; j++) { 32 v = 10.0 * i + j; 33 PetscCall(MatSetValues(mat, 1, &i, 1, &j, &v, INSERT_VALUES)); 34 } 35 } 36 PetscCall(MatAssemblyBegin(mat, MAT_FINAL_ASSEMBLY)); 37 PetscCall(MatAssemblyEnd(mat, MAT_FINAL_ASSEMBLY)); 38 PetscCall(MatView(mat, PETSC_VIEWER_STDOUT_WORLD)); 39 40 /* Free data structures */ 41 PetscCall(MatDestroy(&mat)); 42 PetscCall(PetscFinalize()); 43 return 0; 44 } 45 46 /*TEST 47 48 test: 49 output_file: output/ex107.out 50 51 test: 52 suffix: 2 53 args: -mat_type baij -mat_block_size 2 -m 10 54 55 TEST*/ 56