[petsc-users] preconditioning with Matrix-Free SNES

[Jed Brown]

On Tue, Jun 12, 2012 at 11:12 AM, behzad baghapour <
behzad.baghapour at gmail.com> wrote:

> Thank you. Now, I received the error which I should change Mat into mffd.


*Always* include the entire error message!

You have to assemble a matrix to use most preconditioners.
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