1 2 static char help[] = "Test MatCreate() with MAT_STRUCTURE_ONLY .\n\n"; 3 4 #include <petscmat.h> 5 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; 13 14 PetscFunctionBeginUser; 15 PetscCall(PetscInitialize(&argc, &argv, (char *)0, help)); 16 PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size)); 17 PetscCheck(size == 1, PETSC_COMM_WORLD, PETSC_ERR_WRONG_MPI_SIZE, "This is a uniprocessor example only!"); 18 19 PetscCall(PetscViewerPushFormat(PETSC_VIEWER_STDOUT_WORLD, PETSC_VIEWER_ASCII_COMMON)); 20 PetscCall(PetscOptionsGetInt(NULL, NULL, "-m", &m, NULL)); 21 PetscCall(PetscOptionsGetBool(NULL, NULL, "-struct_only", &struct_only, NULL)); 22 n = m; 23 24 /* ------- Assemble matrix, test MatValid() --------- */ 25 PetscCall(MatCreate(PETSC_COMM_WORLD, &mat)); 26 PetscCall(MatSetSizes(mat, PETSC_DECIDE, PETSC_DECIDE, m, n)); 27 PetscCall(MatSetFromOptions(mat)); 28 if (struct_only) PetscCall(MatSetOption(mat, MAT_STRUCTURE_ONLY, PETSC_TRUE)); 29 PetscCall(MatSetUp(mat)); 30 PetscCall(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 PetscCall(MatSetValues(mat, 1, &i, 1, &j, &v, INSERT_VALUES)); 35 } 36 } 37 PetscCall(MatAssemblyBegin(mat, MAT_FINAL_ASSEMBLY)); 38 PetscCall(MatAssemblyEnd(mat, MAT_FINAL_ASSEMBLY)); 39 PetscCall(MatView(mat, PETSC_VIEWER_STDOUT_WORLD)); 40 41 /* Free data structures */ 42 PetscCall(MatDestroy(&mat)); 43 PetscCall(PetscFinalize()); 44 return 0; 45 } 46 47 /*TEST 48 49 test: 50 output_file: output/ex107.out 51 52 test: 53 suffix: 2 54 args: -mat_type baij -mat_block_size 2 -m 10 55 56 TEST*/ 57