Actual source code: ex16.c

petsc-3.8.4 2018-03-24
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  2: static char help[] = "Tests VecSetValuesBlocked() on MPI vectors.\n\n";

  4:  #include <petscvec.h>

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

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

 18:   if (size != 2) SETERRQ(PETSC_COMM_SELF,1,"Must be run with two processors");

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

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

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

 40:   VecDestroy(&x);

 42:   PetscFinalize();
 43:   return ierr;
 44: }