On Wed, Oct 10, 2012 at 3:32 PM, <span dir="ltr"><<a href="mailto:panourg@mech.upatras.gr" target="_blank">panourg@mech.upatras.gr</a>></span> wrote:<br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Dear all<br>
<br>
I have a non-linear system which i want to solve it with matrix free<br>
method. However i must form the whole proconditioning matrix using finite<br>
differences and coloring method.<br></blockquote><div><br></div><div>How is the preconditioning matrix different from the actual operator?</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
I can set the function F() of non-linear system (i take the notation F()<br>
from documentation).<br>
<br>
Could you send me exactly the commands and the order of it which i must<br>
use or an apt example for that?<br>
<br>
I have looked for that in internet but i could not find any suitable example.<br>
<br>
Kostas<br>
<br>
Thanks<br>
<br>
</blockquote></div><br>