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;

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


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

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

 40:   VecView(y,PETSC_VIEWER_STDOUT_WORLD);

 42:   VecDestroy(&x);
 43:   VecDestroy(&y);

 45:   PetscFinalize();
 46:   return 0;
 47: }

 49: /*TEST

 51:      test:
 52:        nsize: 2

 54:      test:
 55:        suffix: 2
 56:        nsize: 2
 57:        args: -vec_view ascii::ascii_info

 59: TEST*/