>> 2012-11-25 00:46:29?"Jed Brown" <jedbrown at mcs.anl.gov> ???
>>On Sat, Nov 24, 2012 at 5:38 PM, w_ang_temp <w_ang_temp at 163.com> wrote:
>> So, is there no effective way to determine a suitable m? Only by doing
>> lots of tests to find
>>an appropriate value in practical application? Or something need to be
>>noticeable of using GMRES
>>with an effective way?
>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".
This article is interesting and helpful. Thanks.
>Consider using MINRES instead of GMRES.
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