[petsc-users] Use of DMDAVecGetArrayF90 and DMDAVecRestoreArrayF90

[TAY wee-beng]

Hi,

Inside my subroutine, I need to access the DA variable cu_types_array 
frequently.

So I need to call DMDAVecGetArrayF90 and DMDAVecRestoreArrayF90 before 
and after frequently.

Is this necessary? Can I call DMDAVecGetArrayF90 at the start and only 
call DMDAVecRestoreArrayF90 towards the end, where I don't need to 
modify the values of cu_types_array anymore?

Will this cause memory corruption?

Also, must the array be restored using DMDAVecRestoreArrayF90 before 
calling DMLocalToLocalBegin,DMLocalToLocalEnd?

-- 
Thank you.

Yours sincerely,

TAY wee-beng