[petsc-users] Indefinite PC

[Jed Brown]

Anush Krishnan <k.anush at gmail.com> writes:
> And is it possible to generate an indefinite preconditioner from a
> matrix that is symmetric positive definite (I remember seeing a thread
> about this recently)?

See, for example, Kershaw's matrix in src/ksp/pc/examples/tutorials/ex1.c.
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