Actual source code: ex16.c

petsc-3.13.4 2020-08-01
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  1: static char help[] = "Tests VecSetValuesBlocked() on MPI vectors.\n\n";

  3:  #include <petscvec.h>

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

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

 17:   if (size != 2) SETERRQ(PETSC_COMM_WORLD,PETSC_ERR_WRONG_MPI_SIZE,"Must be run with two processors");

 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) {
 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) {
 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 ierr;
 59: }



 63: /*TEST

 65:    test:
 66:       nsize: 2

 68: TEST*/