[petsc-users] solving multiple linear systems with same matrix (sequentially, not simultaneously)

[Jed Brown]

Daniel Goldberg <dngoldberg at gmail.com> writes:

> Thanks Jed.
>
> So the nullspace would be initialized with an array of 3 petsc vectors:
> (u,v)= (0,1), (1,0), and (-y,x), correct?
>
> And also to be sure -- this is usefuil only for multigrid preconditioners,
> yes?

Yes, and perhaps also for some exotic domain decomposition methods.
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