Actual source code: ex7.c


  2: static char help[] = "Tests MatILUFactorSymbolic() on matrix with missing diagonal.\n\n";

  4: #include <petscmat.h>
  5: #include <petscpc.h>

  7: int main(int argc, char **args)
  8: {
  9:   Mat         C, A;
 10:   PetscInt    i, j;
 11:   PetscScalar v;
 12:   PC          pc;
 13:   Vec         xtmp;

 16:   PetscInitialize(&argc, &args, (char *)0, help);
 17:   MatCreate(PETSC_COMM_WORLD, &C);
 18:   MatSetSizes(C, PETSC_DECIDE, PETSC_DECIDE, 3, 3);
 19:   MatSetFromOptions(C);
 20:   MatSetUp(C);
 21:   VecCreateSeq(PETSC_COMM_WORLD, 3, &xtmp);
 22:   i = 0;
 23:   j = 0;
 24:   v = 4;
 25:   MatSetValues(C, 1, &i, 1, &j, &v, INSERT_VALUES);
 26:   i = 0;
 27:   j = 2;
 28:   v = 1;
 29:   MatSetValues(C, 1, &i, 1, &j, &v, INSERT_VALUES);
 30:   i = 1;
 31:   j = 0;
 32:   v = 1;
 33:   MatSetValues(C, 1, &i, 1, &j, &v, INSERT_VALUES);
 34:   i = 1;
 35:   j = 1;
 36:   v = 4;
 37:   MatSetValues(C, 1, &i, 1, &j, &v, INSERT_VALUES);
 38:   i = 2;
 39:   j = 1;
 40:   v = 1;
 41:   MatSetValues(C, 1, &i, 1, &j, &v, INSERT_VALUES);

 43:   MatAssemblyBegin(C, MAT_FINAL_ASSEMBLY);
 44:   MatAssemblyEnd(C, MAT_FINAL_ASSEMBLY);

 46:   MatView(C, PETSC_VIEWER_STDOUT_WORLD);
 47:   PCCreate(PETSC_COMM_WORLD, &pc);
 48:   PCSetFromOptions(pc);
 49:   PCSetOperators(pc, C, C);
 50:   PCSetUp(pc);
 51:   PCFactorGetMatrix(pc, &A);
 52:   MatView(A, PETSC_VIEWER_STDOUT_WORLD);

 54:   PCDestroy(&pc);
 55:   VecDestroy(&xtmp);
 56:   MatDestroy(&C);

 58:   PetscFinalize();
 59:   return 0;
 60: }