1 static char help[] = "Tests converting a SBAIJ matrix to BAIJ format with MatConvert. Modified from ex55.c\n\n"; 2 3 #include <petscmat.h> 4 /* Usage: ./ex141 -mat_view */ 5 6 int main(int argc, char **args) 7 { 8 Mat C, B; 9 PetscInt i, bs = 2, mbs, m, block, d_nz = 6, col[3]; 10 PetscMPIInt size; 11 char file[PETSC_MAX_PATH_LEN]; 12 PetscViewer fd; 13 PetscBool equal, loadmat; 14 PetscScalar value[4]; 15 PetscInt ridx[2], cidx[2]; 16 17 PetscFunctionBeginUser; 18 PetscCall(PetscInitialize(&argc, &args, NULL, help)); 19 PetscCall(PetscOptionsGetString(NULL, NULL, "-f", file, sizeof(file), &loadmat)); 20 PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size)); 21 PetscCheck(size == 1, PETSC_COMM_WORLD, PETSC_ERR_WRONG_MPI_SIZE, "This is a uniprocessor example only!"); 22 23 /* input matrix C */ 24 if (loadmat) { 25 /* Open binary file. Load a sbaij matrix, then destroy the viewer. */ 26 PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD, file, FILE_MODE_READ, &fd)); 27 PetscCall(MatCreate(PETSC_COMM_WORLD, &C)); 28 PetscCall(MatSetType(C, MATSEQSBAIJ)); 29 PetscCall(MatLoad(C, fd)); 30 PetscCall(PetscViewerDestroy(&fd)); 31 } else { /* Create a sbaij mat with bs>1 */ 32 mbs = 8; 33 PetscCall(PetscOptionsGetInt(NULL, NULL, "-mbs", &mbs, NULL)); 34 m = mbs * bs; 35 PetscCall(MatCreate(PETSC_COMM_WORLD, &C)); 36 PetscCall(MatSetSizes(C, PETSC_DECIDE, PETSC_DECIDE, m, m)); 37 PetscCall(MatSetType(C, MATSBAIJ)); 38 PetscCall(MatSetFromOptions(C)); 39 PetscCall(MatSeqSBAIJSetPreallocation(C, bs, d_nz, NULL)); 40 PetscCall(MatSetUp(C)); 41 PetscCall(MatSetOption(C, MAT_IGNORE_LOWER_TRIANGULAR, PETSC_TRUE)); 42 43 for (block = 0; block < mbs; block++) { 44 /* diagonal blocks */ 45 value[0] = -1.0; 46 value[1] = 4.0; 47 value[2] = -1.0; 48 for (i = 1 + block * bs; i < bs - 1 + block * bs; i++) { 49 col[0] = i - 1; 50 col[1] = i; 51 col[2] = i + 1; 52 PetscCall(MatSetValues(C, 1, &i, 3, col, value, INSERT_VALUES)); 53 } 54 i = bs - 1 + block * bs; 55 col[0] = bs - 2 + block * bs; 56 col[1] = bs - 1 + block * bs; 57 58 value[0] = -1.0; 59 value[1] = 4.0; 60 PetscCall(MatSetValues(C, 1, &i, 2, col, value, INSERT_VALUES)); 61 62 i = 0 + block * bs; 63 col[0] = 0 + block * bs; 64 col[1] = 1 + block * bs; 65 66 value[0] = 4.0; 67 value[1] = -1.0; 68 PetscCall(MatSetValues(C, 1, &i, 2, col, value, INSERT_VALUES)); 69 } 70 /* off-diagonal blocks */ 71 value[0] = -1.0; 72 value[1] = -0.1; 73 value[2] = 0.0; 74 value[3] = -1.0; /* row-oriented */ 75 for (block = 0; block < mbs - 1; block++) { 76 for (i = 0; i < bs; i++) { 77 ridx[i] = block * bs + i; 78 cidx[i] = (block + 1) * bs + i; 79 } 80 PetscCall(MatSetValues(C, bs, ridx, bs, cidx, value, INSERT_VALUES)); 81 } 82 PetscCall(MatAssemblyBegin(C, MAT_FINAL_ASSEMBLY)); 83 PetscCall(MatAssemblyEnd(C, MAT_FINAL_ASSEMBLY)); 84 } 85 86 /* convert C to BAIJ format */ 87 PetscCall(MatConvert(C, MATSEQBAIJ, MAT_INITIAL_MATRIX, &B)); 88 PetscCall(MatMultEqual(B, C, 10, &equal)); 89 PetscCheck(equal, PETSC_COMM_SELF, PETSC_ERR_PLIB, "MatConvert fails!"); 90 91 PetscCall(MatDestroy(&B)); 92 PetscCall(MatDestroy(&C)); 93 PetscCall(PetscFinalize()); 94 return 0; 95 } 96 97 /*TEST 98 99 test: 100 output_file: output/empty.out 101 102 TEST*/ 103