1c4762a1bSJed Brown 2c4762a1bSJed Brown static char help[] = "Tests automatic allocation of matrix storage space.\n\n"; 3c4762a1bSJed Brown 4c4762a1bSJed Brown #include <petscmat.h> 5c4762a1bSJed Brown 6*9371c9d4SSatish Balay int main(int argc, char **args) { 7c4762a1bSJed Brown Mat C; 8c4762a1bSJed Brown PetscInt i, j, m = 3, n = 3, Ii, J; 9c4762a1bSJed Brown PetscScalar v; 10c4762a1bSJed Brown MatInfo info; 11c4762a1bSJed Brown 12327415f7SBarry Smith PetscFunctionBeginUser; 139566063dSJacob Faibussowitsch PetscCall(PetscInitialize(&argc, &args, (char *)0, help)); 149566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL, NULL, "-m", &m, NULL)); 159566063dSJacob Faibussowitsch PetscCall(PetscOptionsGetInt(NULL, NULL, "-n", &n, NULL)); 16c4762a1bSJed Brown 17c4762a1bSJed Brown /* create the matrix for the five point stencil, YET AGAIN */ 189566063dSJacob Faibussowitsch PetscCall(MatCreate(PETSC_COMM_SELF, &C)); 199566063dSJacob Faibussowitsch PetscCall(MatSetSizes(C, PETSC_DECIDE, PETSC_DECIDE, m * n, m * n)); 209566063dSJacob Faibussowitsch PetscCall(MatSetFromOptions(C)); 219566063dSJacob Faibussowitsch PetscCall(MatSetUp(C)); 22c4762a1bSJed Brown for (i = 0; i < m; i++) { 23c4762a1bSJed Brown for (j = 0; j < n; j++) { 24*9371c9d4SSatish Balay v = -1.0; 25*9371c9d4SSatish Balay Ii = j + n * i; 26*9371c9d4SSatish Balay if (i > 0) { 27*9371c9d4SSatish Balay J = Ii - n; 28*9371c9d4SSatish Balay PetscCall(MatSetValues(C, 1, &Ii, 1, &J, &v, INSERT_VALUES)); 29*9371c9d4SSatish Balay } 30*9371c9d4SSatish Balay if (i < m - 1) { 31*9371c9d4SSatish Balay J = Ii + n; 32*9371c9d4SSatish Balay PetscCall(MatSetValues(C, 1, &Ii, 1, &J, &v, INSERT_VALUES)); 33*9371c9d4SSatish Balay } 34*9371c9d4SSatish Balay if (j > 0) { 35*9371c9d4SSatish Balay J = Ii - 1; 36*9371c9d4SSatish Balay PetscCall(MatSetValues(C, 1, &Ii, 1, &J, &v, INSERT_VALUES)); 37*9371c9d4SSatish Balay } 38*9371c9d4SSatish Balay if (j < n - 1) { 39*9371c9d4SSatish Balay J = Ii + 1; 40*9371c9d4SSatish Balay PetscCall(MatSetValues(C, 1, &Ii, 1, &J, &v, INSERT_VALUES)); 41*9371c9d4SSatish Balay } 42*9371c9d4SSatish Balay v = 4.0; 43*9371c9d4SSatish Balay PetscCall(MatSetValues(C, 1, &Ii, 1, &Ii, &v, INSERT_VALUES)); 44c4762a1bSJed Brown } 45c4762a1bSJed Brown } 469566063dSJacob Faibussowitsch PetscCall(MatAssemblyBegin(C, MAT_FINAL_ASSEMBLY)); 479566063dSJacob Faibussowitsch PetscCall(MatAssemblyEnd(C, MAT_FINAL_ASSEMBLY)); 489566063dSJacob Faibussowitsch PetscCall(MatView(C, PETSC_VIEWER_STDOUT_SELF)); 49c4762a1bSJed Brown 509566063dSJacob Faibussowitsch PetscCall(MatGetInfo(C, MAT_LOCAL, &info)); 519566063dSJacob Faibussowitsch PetscCall(PetscPrintf(PETSC_COMM_SELF, "matrix nonzeros = %" PetscInt_FMT ", allocated nonzeros = %" PetscInt_FMT "\n", (PetscInt)info.nz_used, (PetscInt)info.nz_allocated)); 52c4762a1bSJed Brown 539566063dSJacob Faibussowitsch PetscCall(MatDestroy(&C)); 549566063dSJacob Faibussowitsch PetscCall(PetscFinalize()); 55b122ec5aSJacob Faibussowitsch return 0; 56c4762a1bSJed Brown } 57c4762a1bSJed Brown 58c4762a1bSJed Brown /*TEST 59c4762a1bSJed Brown 60c4762a1bSJed Brown test: 61c4762a1bSJed Brown 62c4762a1bSJed Brown TEST*/ 63