1c4762a1bSJed Brown 2c4762a1bSJed Brown static char help[] = "Saves a dense matrix in a dense format (binary).\n\n"; 3c4762a1bSJed Brown 4c4762a1bSJed Brown #include <petscmat.h> 5c4762a1bSJed Brown 6*d71ae5a4SJacob Faibussowitsch int main(int argc, char **args) 7*d71ae5a4SJacob Faibussowitsch { 8c4762a1bSJed Brown Mat C; 9c4762a1bSJed Brown PetscScalar v; 10c4762a1bSJed Brown PetscInt i, j, m = 4, n = 4; 11c4762a1bSJed Brown PetscMPIInt rank, size; 12c4762a1bSJed Brown PetscViewer viewer; 13c4762a1bSJed Brown 14327415f7SBarry Smith PetscFunctionBeginUser; 159566063dSJacob Faibussowitsch PetscCall(PetscInitialize(&argc, &args, (char *)0, help)); 169566063dSJacob Faibussowitsch PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank)); 179566063dSJacob Faibussowitsch PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size)); 189566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL, NULL, "-m", &m, NULL)); 199566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL, NULL, "-n", &n, NULL)); 20c4762a1bSJed Brown 21c4762a1bSJed Brown /* PART 1: Generate matrix, then write it in binary format */ 22c4762a1bSJed Brown 23c4762a1bSJed Brown /* Generate matrix */ 249566063dSJacob Faibussowitsch PetscCall(MatCreateSeqDense(PETSC_COMM_WORLD, m, n, NULL, &C)); 25c4762a1bSJed Brown for (i = 0; i < m; i++) { 26c4762a1bSJed Brown for (j = 0; j < n; j++) { 27c4762a1bSJed Brown v = i * m + j; 289566063dSJacob Faibussowitsch PetscCall(MatSetValues(C, 1, &i, 1, &j, &v, INSERT_VALUES)); 29c4762a1bSJed Brown } 30c4762a1bSJed Brown } 319566063dSJacob Faibussowitsch PetscCall(MatAssemblyBegin(C, MAT_FINAL_ASSEMBLY)); 329566063dSJacob Faibussowitsch PetscCall(MatAssemblyEnd(C, MAT_FINAL_ASSEMBLY)); 339566063dSJacob Faibussowitsch PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD, "matrix.dat", FILE_MODE_WRITE, &viewer)); 349566063dSJacob Faibussowitsch PetscCall(MatView(C, viewer)); 359566063dSJacob Faibussowitsch PetscCall(PetscViewerDestroy(&viewer)); 369566063dSJacob Faibussowitsch PetscCall(MatDestroy(&C)); 379566063dSJacob Faibussowitsch PetscCall(PetscFinalize()); 38b122ec5aSJacob Faibussowitsch return 0; 39c4762a1bSJed Brown } 40c4762a1bSJed Brown 41c4762a1bSJed Brown /*TEST 42c4762a1bSJed Brown 43c4762a1bSJed Brown test: 44c4762a1bSJed Brown 45c4762a1bSJed Brown TEST*/ 46