[petsc-users] KSPSetDM problem

[Jed Brown]

Michele Rosso <mrosso at uci.edu> writes:

> Barry,
>
> thank you.
> I have another question: how does petsc compute the restriction 
> (assuming  the user does not supply his own restriction)?
> Does it use a simple transpose of the interpolation operator? 

Yes, it uses the same.

> Could you point me to the source code where this is done?

See the implementation of PCMGGetInterpolation and PCMGGetRestriction.
If you only provide one, the other will use it.
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