<div class="gmail_quote">On Wed, Apr 25, 2012 at 15:03, Dominik Szczerba <span dir="ltr"><<a href="mailto:dominik@itis.ethz.ch">dominik@itis.ethz.ch</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div class="im">> This is not what I said. Look closely at the above. I said the<br>
> preconditioner you give<br>
> back when using -snes_mf_operator is not right. This has nothing to do with<br>
> normal<br>
> operation.<br>
<br>
</div>I am sorry, I do not follow what this might possibly mean for me.</blockquote></div><br><div>The operator you provided for preconditioning is not close to the finite differenced operator. I.e. your residual evaluation and Jacobian assembly are different to first order, probably one or both is buggy.</div>