Actual source code: ex16.c

  1: static char help[] = "Tests VecSetValuesBlocked() on MPI vectors.\n\n";

  3: #include <petscvec.h>

  5: int main(int argc, char **argv)
  6: {
  7:   PetscMPIInt size, rank;
  8:   PetscInt    i, n = 8, bs = 2, indices[2];
  9:   PetscScalar values[4];
 10:   Vec         x;

 13:   PetscInitialize(&argc, &argv, (char *)0, help);
 14:   MPI_Comm_size(PETSC_COMM_WORLD, &size);
 15:   MPI_Comm_rank(PETSC_COMM_WORLD, &rank);


 19:   /* create vector */
 20:   VecCreate(PETSC_COMM_WORLD, &x);
 21:   VecSetSizes(x, PETSC_DECIDE, n);
 22:   VecSetBlockSize(x, bs);
 23:   VecSetFromOptions(x);

 25:   if (rank == 0) {
 26:     for (i = 0; i < 4; i++) values[i] = i + 1;
 27:     indices[0] = 0;
 28:     indices[1] = 2;
 29:     VecSetValuesBlocked(x, 2, indices, values, INSERT_VALUES);
 30:   }
 31:   VecAssemblyBegin(x);
 32:   VecAssemblyEnd(x);

 34:   /*
 35:       Resulting vector should be 1 2 0 0 3 4 0 0
 36:   */
 37:   VecView(x, PETSC_VIEWER_STDOUT_WORLD);

 39:   /* test insertion with negative indices */
 40:   VecSetOption(x, VEC_IGNORE_NEGATIVE_INDICES, PETSC_TRUE);
 41:   if (rank == 0) {
 42:     for (i = 0; i < 4; i++) values[i] = -(i + 1);
 43:     indices[0] = -1;
 44:     indices[1] = 3;
 45:     VecSetValuesBlocked(x, 2, indices, values, INSERT_VALUES);
 46:   }
 47:   VecAssemblyBegin(x);
 48:   VecAssemblyEnd(x);

 50:   /*
 51:       Resulting vector should be 1 2 0 0 3 4 -3 -4
 52:   */
 53:   VecView(x, PETSC_VIEWER_STDOUT_WORLD);

 55:   VecDestroy(&x);

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

 61: /*TEST

 63:    test:
 64:       nsize: 2

 66: TEST*/