[petsc-users] How to view petsc array?

[Matthew Knepley]

On Tue, Jul 21, 2015 at 1:35 AM, TAY wee-beng <zonexo at gmail.com> wrote:

> Hi,
>
> I need to check the contents of the array which was declared using:
>
> PetscScalar,pointer ::
> u_array(:,:,:),v_array(:,:,:),w_array(:,:,:),p_array(:,:,:)
>
> I tried to use :
>
> call PetscViewerASCIIOpen(MPI_COMM_WORLD,"pres.txt",viewer,ierr)
>
> call VecView(p_array,viewer,ierr)
>
> or
>
> call MatView(p_array,viewer,ierr)
>
> call PetscViewerDestroy(viewer,ierr)
>
> but I got segmentation error. So is there a PETSc routine I can use?


No. Those routines work only for Vec objects. You could

 a) Declare a DMDA of the same size

 b) Use DMDAVecGetArrayF90() to get out the multidimensional array

 c) Use that in your code

 d) Use VecView() on the original vector

   Matt


>
> --
> Thank you
>
> Yours sincerely,
>
> TAY wee-beng
>
>


-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener
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