Actual source code: ex17.c

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

 4:  #include petscda.h

  8: int main(int argc,char **argv)
  9: {
 10:   PetscInt       M = 14,dof = 1,s = 1,ratio = 2,dim = 2;
 12:   DA             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(PETSC_NULL,"-dim",&dim,PETSC_NULL);
 21:   PetscOptionsGetInt(PETSC_NULL,"-M",&M,PETSC_NULL);
 22:   PetscOptionsGetInt(PETSC_NULL,"-sw",&s,PETSC_NULL);
 23:   PetscOptionsGetInt(PETSC_NULL,"-ratio",&ratio,PETSC_NULL);
 24:   PetscOptionsGetInt(PETSC_NULL,"-dof",&dof,PETSC_NULL);

 26:   comm_f = PETSC_COMM_WORLD;
 27:   DASplitComm2d(comm_f,M,M,s,&comm_c);
 28: 
 29:   /* Set up the array */
 30:   if (dim == 2) {
 31:     DACreate2d(comm_c,DA_NONPERIODIC,DA_STENCIL_BOX,M,M,PETSC_DECIDE,PETSC_DECIDE,dof,s,PETSC_NULL,PETSC_NULL,&da_c);
 32:     M    = ratio*(M-1) + 1;
 33:     DACreate2d(comm_f,DA_NONPERIODIC,DA_STENCIL_BOX,M,M,PETSC_DECIDE,PETSC_DECIDE,dof,s,PETSC_NULL,PETSC_NULL,&da_f);
 34:   } else if (dim == 3) {
 35:     ;
 36:   }

 38:   DACreateGlobalVector(da_c,&v_c);
 39:   DACreateGlobalVector(da_f,&v_f);

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

 48:   MatDestroy(I);
 49:   VecDestroy(v_c);
 50:   DADestroy(da_c);
 51:   VecDestroy(v_f);
 52:   DADestroy(da_f);
 53:   PetscFinalize();
 54:   return 0;
 55: }
 56: