1c4762a1bSJed Brown 2c4762a1bSJed Brown static char help[] = "Saves a rectangular sparse matrix to disk.\n\n"; 3c4762a1bSJed Brown 4c4762a1bSJed Brown #include <petscmat.h> 5c4762a1bSJed Brown 6*9371c9d4SSatish Balay int main(int argc, char **args) { 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; 139566063dSJacob Faibussowitsch PetscCall(PetscInitialize(&argc, &args, (char *)0, 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) { 21*9371c9d4SSatish Balay for (j = 0; j < n; j += 2) { js[cnt++] = j; } 22c4762a1bSJed Brown } else { 23c4762a1bSJed Brown ; 24c4762a1bSJed Brown } 259566063dSJacob Faibussowitsch PetscCall(MatSetValues(A, 1, &i, cnt, js, values, INSERT_VALUES)); 26c4762a1bSJed Brown } 279566063dSJacob Faibussowitsch PetscCall(MatAssemblyBegin(A, MAT_FINAL_ASSEMBLY)); 289566063dSJacob Faibussowitsch PetscCall(MatAssemblyEnd(A, MAT_FINAL_ASSEMBLY)); 29c4762a1bSJed Brown 309566063dSJacob Faibussowitsch PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD, "rect", FILE_MODE_WRITE, &view)); 319566063dSJacob Faibussowitsch PetscCall(MatView(A, view)); 329566063dSJacob Faibussowitsch PetscCall(PetscViewerDestroy(&view)); 33c4762a1bSJed Brown 349566063dSJacob Faibussowitsch PetscCall(MatDestroy(&A)); 35c4762a1bSJed Brown 369566063dSJacob Faibussowitsch PetscCall(PetscFinalize()); 37b122ec5aSJacob Faibussowitsch return 0; 38c4762a1bSJed Brown } 39c4762a1bSJed Brown 40c4762a1bSJed Brown /*TEST 41c4762a1bSJed Brown 42c4762a1bSJed Brown test: 43c4762a1bSJed Brown 44c4762a1bSJed Brown TEST*/ 45