1c4762a1bSJed Brown static char help[] = "Saves a dense matrix in a dense format (binary).\n\n"; 2c4762a1bSJed Brown 3c4762a1bSJed Brown #include <petscmat.h> 4c4762a1bSJed Brown 5d71ae5a4SJacob Faibussowitsch int main(int argc, char **args) 6d71ae5a4SJacob Faibussowitsch { 7c4762a1bSJed Brown Mat C; 8c4762a1bSJed Brown PetscScalar v; 9c4762a1bSJed Brown PetscInt i, j, m = 4, n = 4; 10c4762a1bSJed Brown PetscMPIInt rank, size; 11c4762a1bSJed Brown PetscViewer viewer; 12c4762a1bSJed Brown 13327415f7SBarry Smith PetscFunctionBeginUser; 14c8025a54SPierre Jolivet PetscCall(PetscInitialize(&argc, &args, NULL, help)); 159566063dSJacob Faibussowitsch PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank)); 169566063dSJacob Faibussowitsch PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size)); 179566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL, NULL, "-m", &m, NULL)); 189566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL, NULL, "-n", &n, NULL)); 19c4762a1bSJed Brown 20c4762a1bSJed Brown /* PART 1: Generate matrix, then write it in binary format */ 21c4762a1bSJed Brown 22c4762a1bSJed Brown /* Generate matrix */ 239566063dSJacob Faibussowitsch PetscCall(MatCreateSeqDense(PETSC_COMM_WORLD, m, n, NULL, &C)); 24c4762a1bSJed Brown for (i = 0; i < m; i++) { 25c4762a1bSJed Brown for (j = 0; j < n; j++) { 26c4762a1bSJed Brown v = i * m + j; 279566063dSJacob Faibussowitsch PetscCall(MatSetValues(C, 1, &i, 1, &j, &v, INSERT_VALUES)); 28c4762a1bSJed Brown } 29c4762a1bSJed Brown } 309566063dSJacob Faibussowitsch PetscCall(MatAssemblyBegin(C, MAT_FINAL_ASSEMBLY)); 319566063dSJacob Faibussowitsch PetscCall(MatAssemblyEnd(C, MAT_FINAL_ASSEMBLY)); 329566063dSJacob Faibussowitsch PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD, "matrix.dat", FILE_MODE_WRITE, &viewer)); 339566063dSJacob Faibussowitsch PetscCall(MatView(C, viewer)); 349566063dSJacob Faibussowitsch PetscCall(PetscViewerDestroy(&viewer)); 359566063dSJacob Faibussowitsch PetscCall(MatDestroy(&C)); 369566063dSJacob Faibussowitsch PetscCall(PetscFinalize()); 37b122ec5aSJacob Faibussowitsch return 0; 38c4762a1bSJed Brown } 39c4762a1bSJed Brown 40c4762a1bSJed Brown /*TEST 41c4762a1bSJed Brown 42c4762a1bSJed Brown test: 43*3886731fSPierre Jolivet output_file: output/empty.out 44c4762a1bSJed Brown 45c4762a1bSJed Brown TEST*/ 46