1c4762a1bSJed Brown 2c4762a1bSJed Brown static char help[] = "Tests reordering a matrix.\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 = 5, n = 5, Ii, J; 9c4762a1bSJed Brown PetscScalar v; 10c4762a1bSJed Brown IS perm, iperm; 11c4762a1bSJed Brown 12327415f7SBarry Smith PetscFunctionBeginUser; 139566063dSJacob Faibussowitsch PetscCall(PetscInitialize(&argc, &args, (char *)0, help)); 149566063dSJacob Faibussowitsch PetscCall(MatCreate(PETSC_COMM_SELF, &C)); 159566063dSJacob Faibussowitsch PetscCall(MatSetSizes(C, PETSC_DECIDE, PETSC_DECIDE, m * n, m * n)); 169566063dSJacob Faibussowitsch PetscCall(MatSetFromOptions(C)); 179566063dSJacob Faibussowitsch PetscCall(MatSetUp(C)); 18c4762a1bSJed Brown 19c4762a1bSJed Brown /* create the matrix for the five point stencil, YET AGAIN*/ 20c4762a1bSJed Brown for (i = 0; i < m; i++) { 21c4762a1bSJed Brown for (j = 0; j < n; j++) { 22*9371c9d4SSatish Balay v = -1.0; 23*9371c9d4SSatish Balay Ii = j + n * i; 24*9371c9d4SSatish Balay if (i > 0) { 25*9371c9d4SSatish Balay J = Ii - n; 26*9371c9d4SSatish Balay PetscCall(MatSetValues(C, 1, &Ii, 1, &J, &v, INSERT_VALUES)); 27*9371c9d4SSatish Balay } 28*9371c9d4SSatish Balay if (i < m - 1) { 29*9371c9d4SSatish Balay J = Ii + n; 30*9371c9d4SSatish Balay PetscCall(MatSetValues(C, 1, &Ii, 1, &J, &v, INSERT_VALUES)); 31*9371c9d4SSatish Balay } 32*9371c9d4SSatish Balay if (j > 0) { 33*9371c9d4SSatish Balay J = Ii - 1; 34*9371c9d4SSatish Balay PetscCall(MatSetValues(C, 1, &Ii, 1, &J, &v, INSERT_VALUES)); 35*9371c9d4SSatish Balay } 36*9371c9d4SSatish Balay if (j < n - 1) { 37*9371c9d4SSatish Balay J = Ii + 1; 38*9371c9d4SSatish Balay PetscCall(MatSetValues(C, 1, &Ii, 1, &J, &v, INSERT_VALUES)); 39*9371c9d4SSatish Balay } 40*9371c9d4SSatish Balay v = 4.0; 41*9371c9d4SSatish Balay PetscCall(MatSetValues(C, 1, &Ii, 1, &Ii, &v, INSERT_VALUES)); 42c4762a1bSJed Brown } 43c4762a1bSJed Brown } 449566063dSJacob Faibussowitsch PetscCall(MatAssemblyBegin(C, MAT_FINAL_ASSEMBLY)); 459566063dSJacob Faibussowitsch PetscCall(MatAssemblyEnd(C, MAT_FINAL_ASSEMBLY)); 46c4762a1bSJed Brown 479566063dSJacob Faibussowitsch PetscCall(MatGetOrdering(C, MATORDERINGND, &perm, &iperm)); 489566063dSJacob Faibussowitsch PetscCall(ISView(perm, PETSC_VIEWER_STDOUT_SELF)); 499566063dSJacob Faibussowitsch PetscCall(ISView(iperm, PETSC_VIEWER_STDOUT_SELF)); 509566063dSJacob Faibussowitsch PetscCall(MatView(C, PETSC_VIEWER_STDOUT_SELF)); 51c4762a1bSJed Brown 529566063dSJacob Faibussowitsch PetscCall(ISDestroy(&perm)); 539566063dSJacob Faibussowitsch PetscCall(ISDestroy(&iperm)); 549566063dSJacob Faibussowitsch PetscCall(MatDestroy(&C)); 559566063dSJacob Faibussowitsch PetscCall(PetscFinalize()); 56b122ec5aSJacob Faibussowitsch return 0; 57c4762a1bSJed Brown } 58c4762a1bSJed Brown 59c4762a1bSJed Brown /*TEST 60c4762a1bSJed Brown 61c4762a1bSJed Brown test: 62c4762a1bSJed Brown 63c4762a1bSJed Brown TEST*/ 64