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<div class="moz-cite-prefix">On 28/10/2012 2:17 PM, Jed Brown wrote:<br>
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cite="mid:CAM9tzSkR6O822BifVZu5Y1v8mcHywqCJft6B=A7hj19LdyNZTA@mail.gmail.com"
type="cite">
<p>Algebraic multigrid can be used directly, -pc_type gamg
-pc_gamg_agg_nsmooths 1. Geometric either required that you use
the PCMG interface to set interpolation (and provide a coarse
operator for non-Galerkin) or use a DM that provides coarsening
capability.</p>
<p>What kind of problem are you solving?</p>
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<br>
Hi, <br>
<br>
May I know if there is an example which explains using the geometric
MG, either using PCMG or DM?<br>
<br>
<br>
<pre class="moz-signature" cols="72">Yours sincerely,
TAY wee-beng</pre>
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cite="mid:CAM9tzSkR6O822BifVZu5Y1v8mcHywqCJft6B=A7hj19LdyNZTA@mail.gmail.com"
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<div class="gmail_quote">On Oct 28, 2012 6:09 AM, "w_ang_temp"
<<a moz-do-not-send="true" href="mailto:w_ang_temp@163.com">w_ang_temp@163.com</a>>
wrote:<br type="attribution">
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<div style="line-height:1.7;font-size:14px;font-family:arial">
<div>Hello,</div>
<div> I want to use the multigrid as a preconditioner. The
introduction about it in the manual is little.</div>
<div>So are there some typical examples or details about
multigrid? Is it used just like other preconditioners</div>
<div>like jacobi, sor, which can be simply used in the
cammand line options?</div>
<div> Thanks.</div>
<div>
Jim</div>
</div>
<br>
<br>
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