Actual source code: ex17.c

petsc-3.4.2 2013-07-02
  2: static char help[] = "Tests DMDA interpolation for coarse DM on a subset of processors.\n\n";

  4: #include <petscdmda.h>

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

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

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

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

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

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

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

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