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<DIV><BR></DIV>>> 2012-11-25 00:46:29£¬"Jed Brown" <jedbrown@mcs.anl.gov> дµÀ£º<BR>
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<DIV class="gmail_extra">>>On Sat, Nov 24, 2012 at 5:38 PM, w_ang_temp <SPAN dir="ltr"><<A href="mailto:w_ang_temp@163.com" target="_blank">w_ang_temp@163.com</A>></SPAN> wrote:<BR>
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<DIV>>> So, is there no effective way to determine a suitable m? Only by doing lots of tests to find</DIV>
<DIV>>>an appropriate value in practical application? Or something need to be noticeable of using GMRES</DIV>
<DIV>>>with an effective way?</DIV></BLOCKQUOTE></DIV><BR></DIV>
<DIV class="gmail_extra">>Just use the default until it doesn't converge well or until you run out of memory. You're not going to have any theory here unless you know a lot of about your >problem and want to think carefully about it, neither of which seem to be true, and even if it was, it's unlikely to be practically important. If you want some >entertainment, read Mark Embree's 2003 SIAM Review article "The tortoise and the hare restart GMRES".</DIV>
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<DIV class="gmail_extra"> This article is <SPAN id="tran_1_3" jQuery171043593104088559253="31" data-aligning="#src_1_3,#tran_1_3">interesting</SPAN> and helpful. Thanks.<BR></DIV>
<DIV class="gmail_extra">>Consider using MINRES instead of GMRES.</DIV></BLOCKQUOTE></div><br><br><span title="neteasefooter"><span id="netease_mail_footer"></span></span>