2: static char help[] = "Tests DMDA interpolation for coarse DM on a subset of processors.\n\n";

  4: #include <petscdm.h>
  5: #include <petscdmda.h>

  9: int main(int argc,char **argv)
 10: {
 11:   PetscInt       M = 14,dof = 1,s = 1,ratio = 2,dim = 2;
 13:   DM             da_c,da_f;
 14:   Vec            v_c,v_f;
 15:   Mat            I;
 16:   PetscScalar    one = 1.0;
 17:   MPI_Comm       comm_f, comm_c;

 19:   PetscInitialize(&argc,&argv,(char*)0,help);

 21:   PetscOptionsGetInt(NULL,NULL,"-dim",&dim,NULL);
 22:   PetscOptionsGetInt(NULL,NULL,"-M",&M,NULL);
 23:   PetscOptionsGetInt(NULL,NULL,"-sw",&s,NULL);
 24:   PetscOptionsGetInt(NULL,NULL,"-ratio",&ratio,NULL);
 25:   PetscOptionsGetInt(NULL,NULL,"-dof",&dof,NULL);

 27:   comm_f = PETSC_COMM_WORLD;
 28:   DMDASplitComm2d(comm_f,M,M,s,&comm_c);

 30:   /* Set up the array */
 31:   if (dim == 2) {
 32:     DMDACreate2d(comm_c,DM_BOUNDARY_NONE,DM_BOUNDARY_NONE,DMDA_STENCIL_BOX,M,M,PETSC_DECIDE,PETSC_DECIDE,dof,s,NULL,NULL,&da_c);
 33:     M    = ratio*(M-1) + 1;
 34:     DMDACreate2d(comm_f,DM_BOUNDARY_NONE,DM_BOUNDARY_NONE,DMDA_STENCIL_BOX,M,M,PETSC_DECIDE,PETSC_DECIDE,dof,s,NULL,NULL,&da_f);
 35:   }

 37:   DMCreateGlobalVector(da_c,&v_c);
 38:   DMCreateGlobalVector(da_f,&v_f);

 40:   VecSet(v_c,one);
 41:   DMCreateInterpolation(da_c,da_f,&I,NULL);
 42:   MatInterpolate(I,v_c,v_f);
 43:   VecView(v_f,PETSC_VIEWER_STDOUT_(comm_f));
 44:   MatRestrict(I,v_f,v_c);
 45:   VecView(v_c,PETSC_VIEWER_STDOUT_(comm_c));

 47:   MatDestroy(&I);
 48:   VecDestroy(&v_c);
 49:   DMDestroy(&da_c);
 50:   VecDestroy(&v_f);
 51:   DMDestroy(&da_f);
 52:   PetscFinalize();
 53:   return 0;
 54: }