[petsc-users] reusing LU factorization?

[Jed Brown]

David Liu <daveliu at mit.edu> writes:
> Not too sure if there's anything I can do about this. Also, I am definately
> willing to use other preconditioners. If direct solvers are expensive, what
> are the cheaper alternatives?

This is a vast question, a bit like asking what kind of "math" is
important for "physics".  If you want help, you'll have to explain more
about your problem, discretization, and regime.
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