[petsc-users] Modifying the computed TS step, TSSetPostStep vs TSSetPostEvaluate

[Mark Lohry]

For the time iteration

y(t+dt) = y(t) + dt * R(y,t,...)

I need to apply a spectral filter to R prior to moving to the next step,
e.g. so not use exactly the step computed by TS.

Where is the appropriate place to do this? SNES provides
SNESLineSearchSetPostCheck where you can modify the newton step; is there a
TS equivalent?

Or do I need to internally maintain a copy of y(t) to re-compute R and then
call TSSetSolution with a modified vector?
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