2: static char help[] = "Tests DMDA interpolation.\n\n";

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

  7: int main(int argc,char **argv)
  8: {
  9:   PetscInt         M1 = 3,M2,dof = 1,s = 1,ratio = 2,dim = 1;
 10:   PetscErrorCode   ierr;
 11:   DM               da_c,da_f;
 12:   Vec              v_c,v_f;
 13:   Mat              Interp;
 14:   PetscScalar      one = 1.0;
 15:   PetscBool        pt;
 16:   DMBoundaryType   bx = DM_BOUNDARY_NONE,by = DM_BOUNDARY_NONE,bz = DM_BOUNDARY_NONE;

 18:   PetscInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr;
 19:   PetscOptionsGetInt(NULL,NULL,"-dim",&dim,NULL);
 20:   PetscOptionsGetInt(NULL,NULL,"-M",&M1,NULL);
 21:   PetscOptionsGetInt(NULL,NULL,"-stencil_width",&s,NULL);
 22:   PetscOptionsGetInt(NULL,NULL,"-ratio",&ratio,NULL);
 23:   PetscOptionsGetInt(NULL,NULL,"-dof",&dof,NULL);
 24:   PetscOptionsGetBool(NULL,NULL,"-periodic",(PetscBool*)&pt,NULL);

 26:   if (pt) {
 27:     if (dim > 0) bx = DM_BOUNDARY_PERIODIC;
 28:     if (dim > 1) by = DM_BOUNDARY_PERIODIC;
 29:     if (dim > 2) bz = DM_BOUNDARY_PERIODIC;
 30:   }
 31:   if (bx == DM_BOUNDARY_NONE) {
 32:     M2 = ratio*(M1-1) + 1;
 33:   } else {
 34:     M2 = ratio*M1;
 35:   }

 37:   /* Set up the array */
 38:   if (dim == 1) {
 39:     DMDACreate1d(PETSC_COMM_WORLD,bx,M1,dof,s,NULL,&da_c);
 40:     DMDACreate1d(PETSC_COMM_WORLD,bx,M2,dof,s,NULL,&da_f);
 41:   } else if (dim == 2) {
 42:     DMDACreate2d(PETSC_COMM_WORLD,bx,by,DMDA_STENCIL_BOX,M1,M1,PETSC_DECIDE,PETSC_DECIDE,dof,s,NULL,NULL,&da_c);
 43:     DMDACreate2d(PETSC_COMM_WORLD,bx,by,DMDA_STENCIL_BOX,M2,M2,PETSC_DECIDE,PETSC_DECIDE,dof,s,NULL,NULL,&da_f);
 44:   } else if (dim == 3) {
 45:     DMDACreate3d(PETSC_COMM_WORLD,bx,by,bz,DMDA_STENCIL_BOX,M1,M1,M1,PETSC_DECIDE,PETSC_DECIDE,PETSC_DECIDE,dof,s,NULL,NULL,NULL,&da_c);
 46:     DMDACreate3d(PETSC_COMM_WORLD,bx,by,bz,DMDA_STENCIL_BOX,M2,M2,M2,PETSC_DECIDE,PETSC_DECIDE,PETSC_DECIDE,dof,s,NULL,NULL,NULL,&da_f);
 47:   } else SETERRQ(PETSC_COMM_WORLD,PETSC_ERR_SUP,"dim must be 1,2, or 3");
 48:   DMSetFromOptions(da_c);
 49:   DMSetUp(da_c);
 50:   DMSetFromOptions(da_f);
 51:   DMSetUp(da_f);

 53:   DMCreateGlobalVector(da_c,&v_c);
 54:   DMCreateGlobalVector(da_f,&v_f);

 56:   VecSet(v_c,one);
 57:   DMCreateInterpolation(da_c,da_f,&Interp,NULL);
 58:   MatMult(Interp,v_c,v_f);
 59:   VecView(v_f,PETSC_VIEWER_STDOUT_WORLD);
 60:   MatMultTranspose(Interp,v_f,v_c);
 61:   VecView(v_c,PETSC_VIEWER_STDOUT_WORLD);

 63:   MatDestroy(&Interp);
 64:   VecDestroy(&v_c);
 65:   DMDestroy(&da_c);
 66:   VecDestroy(&v_f);
 67:   DMDestroy(&da_f);
 68:   PetscFinalize();
 69:   return ierr;
 70: }