[petsc-dev] stencils, ex2f.F, openmp

[Jed Brown]

Svetlana Tkachenko <svetlana.tkachenko at fastmail.fm> writes:
> The example has a line to compute matrix A from Ax = b, and a line to compute source term (vector b).
>
>> call KSPSetComputeOperators(ksp,ComputeMatrix,ctx,ierr)
>> call KSPSetComputeRHS(ksp,ComputeRHS,ctx,ierr)
>
> What do I use to give it the initial guess on x?

Those lines are registering callbacks, in order to have a uniform
interface that can rediscretize the original operator and on coarse
levels of multigrid.  Look at the implementation of ComputeMatrix and
ComputeRHS for more.
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