[petsc-users] Spatial distribution of the residual after an implicit TS timestep

[Mani Chandra]

-snes_montior_residual is really cool. Anyway I could get it to spit out
png images instead of on screen visualization?


On Sat, Mar 15, 2014 at 6:24 PM, Barry Smith <bsmith at mcs.anl.gov> wrote:

>
>
>    You can write a custom monitor and set it with TSMonitorSet()
>
>     This routine would call TSGetSNES() then SNESGetSolution() then call
> SNESComputeFunction() then call VecView() on the result.
>
>     But note that just because the residual is big somewhere doesn’t mean
> the error need be.
>
>     You could also run with -snes_monitor_residual to see how the residual
> is being reduced inside the nonlinear solve (that is, what parts of the
> residual are most stubborn).
>
>
>     Barry
>
>
> On Mar 15, 2014, at 5:47 PM, Mani Chandra <mc0710 at gmail.com> wrote:
>
> > Hi,
> >
> > Is there anyway I can VecView the residual after TS has completed an
> implicit time step? I'd like to see where in my domain most of the errors
> are coming from. I looked at TSMonitor but that doesn't seem to give me
> access to the residual at the end of the current time step.
> >
> > Thanks,
> > Mani
>
>
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