On Tue, Nov 10, 2015 at 6:30 AM, TAY wee-beng <[email protected]> wrote:
> > On 10/11/2015 8:27 PM, Matthew Knepley wrote: > > On Tue, Nov 10, 2015 at 3:27 AM, TAY wee-beng <[email protected]> wrote: > >> 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? >> > > You cannot use any other vector operations before you have called Restore. > > > Hi, > > What do you mean by vector operations? I will just be doing some maths > operation to change the values in cu_types_array. Is that fine? > While you have the array, no other operation can change the values. Matt > > > Also, must the array be restored using DMDAVecRestoreArrayF90 before >> calling DMLocalToLocalBegin,DMLocalToLocalEnd? > > > Yes. > > 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 > > > -- 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
