1 2 static char help[] = "Tests MatILUFactorSymbolic() on matrix with missing diagonal.\n\n"; 3 4 #include <petscmat.h> 5 #include <petscpc.h> 6 7 int main(int argc, char **args) { 8 Mat C, A; 9 PetscInt i, j; 10 PetscScalar v; 11 PC pc; 12 Vec xtmp; 13 14 PetscFunctionBeginUser; 15 PetscCall(PetscInitialize(&argc, &args, (char *)0, help)); 16 PetscCall(MatCreate(PETSC_COMM_WORLD, &C)); 17 PetscCall(MatSetSizes(C, PETSC_DECIDE, PETSC_DECIDE, 3, 3)); 18 PetscCall(MatSetFromOptions(C)); 19 PetscCall(MatSetUp(C)); 20 PetscCall(VecCreateSeq(PETSC_COMM_WORLD, 3, &xtmp)); 21 i = 0; 22 j = 0; 23 v = 4; 24 PetscCall(MatSetValues(C, 1, &i, 1, &j, &v, INSERT_VALUES)); 25 i = 0; 26 j = 2; 27 v = 1; 28 PetscCall(MatSetValues(C, 1, &i, 1, &j, &v, INSERT_VALUES)); 29 i = 1; 30 j = 0; 31 v = 1; 32 PetscCall(MatSetValues(C, 1, &i, 1, &j, &v, INSERT_VALUES)); 33 i = 1; 34 j = 1; 35 v = 4; 36 PetscCall(MatSetValues(C, 1, &i, 1, &j, &v, INSERT_VALUES)); 37 i = 2; 38 j = 1; 39 v = 1; 40 PetscCall(MatSetValues(C, 1, &i, 1, &j, &v, INSERT_VALUES)); 41 42 PetscCall(MatAssemblyBegin(C, MAT_FINAL_ASSEMBLY)); 43 PetscCall(MatAssemblyEnd(C, MAT_FINAL_ASSEMBLY)); 44 45 PetscCall(MatView(C, PETSC_VIEWER_STDOUT_WORLD)); 46 PetscCall(PCCreate(PETSC_COMM_WORLD, &pc)); 47 PetscCall(PCSetFromOptions(pc)); 48 PetscCall(PCSetOperators(pc, C, C)); 49 PetscCall(PCSetUp(pc)); 50 PetscCall(PCFactorGetMatrix(pc, &A)); 51 PetscCall(MatView(A, PETSC_VIEWER_STDOUT_WORLD)); 52 53 PetscCall(PCDestroy(&pc)); 54 PetscCall(VecDestroy(&xtmp)); 55 PetscCall(MatDestroy(&C)); 56 57 PetscCall(PetscFinalize()); 58 return 0; 59 } 60