[petsc-dev] Non-scalable matrix operations

[Mark F. Adams]

I was assuming context data was stuffed in a Mat.  So whatever your context object is can be used in the solve phase, just passed through to the apply operator.  A graph is just needed for setup, for the ISs.

Mark

On Dec 23, 2011, at 2:33 PM, Jed Brown wrote:

> On Fri, Dec 23, 2011 at 13:31, Mark F. Adams <mark.adams at columbia.edu> wrote:
> Ah yes, by "mat" I'm assuming a shell in this case.  The construction of these ISs needs a graph -- its not magic -- its a parallel multiplicative method.
> 
> Yes, the user should provide a Mat so that the library can build the ISs, but the user shouldn't get a Mat back in their callback because they are being asked to perform a nonlinear operation that does not use a Mat.
> 

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