[petsc-users] da_overlap vs width in dmdacreate

[Barry Smith]

   What arguments are you referring to?

PetscErrorCode  DMDACreate2d(MPI_Comm comm,DMBoundaryType bx,DMBoundaryType by,DMDAStencilType stencil_type,
                          PetscInt M,PetscInt N,PetscInt m,PetscInt n,PetscInt dof,PetscInt s,const PetscInt lx[],const PetscInt ly[],DM *da)

the argument s is the stencil width and depends on the finite difference stencil you want to use. There is no da_overlap argument.

  Barry

> On Jun 24, 2016, at 4:17 PM, Xiangdong <epscodes at gmail.com> wrote:
> 
> Hello everyone,
> 
> I have a quick question. What is the relationship between da_overlap and the width parameter in dmdacreate2d?
> 
> From the examples, it seems that width=1 works with da_overlap=4. Could you please explain the relationship or point me to a reference page?
> 
> Thanks.
> 
> Xiangdong