[petsc-dev] Fwd: [petsc-maint #70675] update of the timestep in theta method

[Vijay S. Mahadevan]

If you provide TSMonitorStep or something along those lines, I do
believe this could be solved. And the interface should also hold for
future modifications where somebody comes up with a custom adaptor to
modify time steps based on physics restrictions/a-priori error
estimates/adaptive posteriori errors etc.. I have used the
TSSetTimeStep with a post-step monitor function before but I feel
knowing the current and previous step solutions would be relevant
arguments for the user to decide an optimal step. My 2 cents.

Vijay

On Mon, Apr 18, 2011 at 2:15 PM, Jed Brown <jed at 59a2.org> wrote:
> On Mon, Apr 18, 2011 at 21:06, Jeremy Riousset <riousset at gatech.edu> wrote:
>>
>> What difference between this and the use of TSSetTimeStep?
>
> Where would you like to call TSSetTimeStep() from? It doesn't make much
> sense to call it from inside residual evaluation, for example. So you can
> register a post-step function that looks at whatever it wants and calls
> TSSetTimeStep().