On Wed, Mar 23, 2011 at 11:46 AM, Rebecca Xuefei Yuan <span dir="ltr"><<a href="mailto:xy2102@columbia.edu">xy2102@columbia.edu</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;">
Hi,<br>
<br>
If the nonlinear system is evaluated at F(u) = 0 in "FormFunction()", but the symbolic Jacobian is not provided. Is there any options that I can call to solve the corresponding linear system by direct solver?<br>
</blockquote><div><br></div><div>-snes_fd, which is very slow.</div><div><br></div><div> Matt</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Thanks very much!<br>
<br>
Best regards,<br><font color="#888888">
<br>
Rebecca<br>
<br>
<br>
</font></blockquote></div><br><br clear="all"><br>-- <br>What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.<br>-- Norbert Wiener<br>