Actual source code: ex3.c


  2: static char help[] = "Tests parallel vector assembly.  Input arguments are\n\
  3:   -n <length> : local vector length\n\n";

  5: #include <petscvec.h>

  7: int main(int argc, char **argv)
  8: {
  9:   PetscMPIInt size, rank;
 10:   PetscInt    n   = 5, idx;
 11:   PetscScalar one = 1.0, two = 2.0, three = 3.0;
 12:   Vec         x, y;

 15:   PetscInitialize(&argc, &argv, (char *)0, help);
 16:   PetscOptionsGetInt(NULL, NULL, "-n", &n, NULL);
 17:   if (n < 5) n = 5;
 18:   MPI_Comm_size(PETSC_COMM_WORLD, &size);
 19:   MPI_Comm_rank(PETSC_COMM_WORLD, &rank);


 23:   /* create two vector */
 24:   VecCreateSeq(PETSC_COMM_SELF, n, &x);
 25:   VecCreate(PETSC_COMM_WORLD, &y);
 26:   VecSetSizes(y, n, PETSC_DECIDE);
 27:   VecSetFromOptions(y);
 28:   VecSet(x, one);
 29:   VecSet(y, two);

 31:   if (rank == 1) {
 32:     idx = 2;
 33:     VecSetValues(y, 1, &idx, &three, INSERT_VALUES);
 34:     idx = 0;
 35:     VecSetValues(y, 1, &idx, &two, INSERT_VALUES);
 36:     idx = 0;
 37:     VecSetValues(y, 1, &idx, &one, INSERT_VALUES);
 38:   } else {
 39:     idx = 7;
 40:     VecSetValues(y, 1, &idx, &three, INSERT_VALUES);
 41:   }
 42:   VecAssemblyBegin(y);
 43:   VecAssemblyEnd(y);

 45:   VecView(y, PETSC_VIEWER_STDOUT_WORLD);

 47:   VecDestroy(&x);
 48:   VecDestroy(&y);

 50:   PetscFinalize();
 51:   return 0;
 52: }

 54: /*TEST

 56:      test:
 57:        nsize: 2

 59:      test:
 60:        suffix: 2
 61:        nsize: 2
 62:        args: -vec_view ascii::ascii_info

 64: TEST*/