1c4762a1bSJed Brown static char help[] = "Saves a rectangular sparse matrix to disk.\n\n"; 2c4762a1bSJed Brown 3c4762a1bSJed Brown #include <petscmat.h> 4c4762a1bSJed Brown 5d71ae5a4SJacob Faibussowitsch int main(int argc, char **args) 6d71ae5a4SJacob Faibussowitsch { 7c4762a1bSJed Brown Mat A; 8c4762a1bSJed Brown PetscInt m = 100, n = 11, js[11], i, j, cnt; 9c4762a1bSJed Brown PetscScalar values[11]; 10c4762a1bSJed Brown PetscViewer view; 11c4762a1bSJed Brown 12327415f7SBarry Smith PetscFunctionBeginUser; 13c8025a54SPierre Jolivet PetscCall(PetscInitialize(&argc, &args, NULL, help)); 149566063dSJacob Faibussowitsch PetscCall(MatCreateSeqAIJ(PETSC_COMM_WORLD, m, n, 20, 0, &A)); 15c4762a1bSJed Brown 16c4762a1bSJed Brown for (i = 0; i < n; i++) values[i] = (PetscReal)i; 17c4762a1bSJed Brown 18c4762a1bSJed Brown for (i = 0; i < m; i++) { 19c4762a1bSJed Brown cnt = 0; 20c4762a1bSJed Brown if (i % 2) { 21ad540459SPierre Jolivet for (j = 0; j < n; j += 2) js[cnt++] = j; 22c4762a1bSJed Brown } 239566063dSJacob Faibussowitsch PetscCall(MatSetValues(A, 1, &i, cnt, js, values, INSERT_VALUES)); 24c4762a1bSJed Brown } 259566063dSJacob Faibussowitsch PetscCall(MatAssemblyBegin(A, MAT_FINAL_ASSEMBLY)); 269566063dSJacob Faibussowitsch PetscCall(MatAssemblyEnd(A, MAT_FINAL_ASSEMBLY)); 27c4762a1bSJed Brown 289566063dSJacob Faibussowitsch PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD, "rect", FILE_MODE_WRITE, &view)); 299566063dSJacob Faibussowitsch PetscCall(MatView(A, view)); 309566063dSJacob Faibussowitsch PetscCall(PetscViewerDestroy(&view)); 31c4762a1bSJed Brown 329566063dSJacob Faibussowitsch PetscCall(MatDestroy(&A)); 33c4762a1bSJed Brown 349566063dSJacob Faibussowitsch PetscCall(PetscFinalize()); 35b122ec5aSJacob Faibussowitsch return 0; 36c4762a1bSJed Brown } 37c4762a1bSJed Brown 38c4762a1bSJed Brown /*TEST 39c4762a1bSJed Brown 40c4762a1bSJed Brown test: 41*3886731fSPierre Jolivet output_file: output/empty.out 42c4762a1bSJed Brown 43c4762a1bSJed Brown TEST*/ 44