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*d71ae5a4SJacob Faibussowitsch int main(int argc, char **args) 7*d71ae5a4SJacob Faibussowitsch { 8c4762a1bSJed Brown Mat A; 9c4762a1bSJed Brown PetscInt m = 100, n = 11, js[11], i, j, cnt; 10c4762a1bSJed Brown PetscScalar values[11]; 11c4762a1bSJed Brown PetscViewer view; 12c4762a1bSJed Brown 13327415f7SBarry Smith PetscFunctionBeginUser; 149566063dSJacob Faibussowitsch PetscCall(PetscInitialize(&argc, &args, (char *)0, help)); 159566063dSJacob Faibussowitsch PetscCall(MatCreateSeqAIJ(PETSC_COMM_WORLD, m, n, 20, 0, &A)); 16c4762a1bSJed Brown 17c4762a1bSJed Brown for (i = 0; i < n; i++) values[i] = (PetscReal)i; 18c4762a1bSJed Brown 19c4762a1bSJed Brown for (i = 0; i < m; i++) { 20c4762a1bSJed Brown cnt = 0; 21c4762a1bSJed Brown if (i % 2) { 22ad540459SPierre Jolivet for (j = 0; j < n; j += 2) js[cnt++] = j; 23c4762a1bSJed Brown } else { 24c4762a1bSJed Brown ; 25c4762a1bSJed Brown } 269566063dSJacob Faibussowitsch PetscCall(MatSetValues(A, 1, &i, cnt, js, values, INSERT_VALUES)); 27c4762a1bSJed Brown } 289566063dSJacob Faibussowitsch PetscCall(MatAssemblyBegin(A, MAT_FINAL_ASSEMBLY)); 299566063dSJacob Faibussowitsch PetscCall(MatAssemblyEnd(A, MAT_FINAL_ASSEMBLY)); 30c4762a1bSJed Brown 319566063dSJacob Faibussowitsch PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD, "rect", FILE_MODE_WRITE, &view)); 329566063dSJacob Faibussowitsch PetscCall(MatView(A, view)); 339566063dSJacob Faibussowitsch PetscCall(PetscViewerDestroy(&view)); 34c4762a1bSJed Brown 359566063dSJacob Faibussowitsch PetscCall(MatDestroy(&A)); 36c4762a1bSJed Brown 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