<div dir="ltr">OK, got it, thanks!<div><br></div><div>David</div><div><br></div><div><br></div><div class="gmail_extra"><div class="gmail_quote">On Thu, Mar 5, 2015 at 5:08 PM, Jed Brown <span dir="ltr"><<a href="mailto:jed@jedbrown.org" target="_blank">jed@jedbrown.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">David Knezevic <<a href="mailto:david.knezevic@akselos.com">david.knezevic@akselos.com</a>> writes:<br>
> I was just wondering if its possible to achieve the same sort of thing with<br>
> other AMG solvers (e.g. BoomerAMG)? I assume that MatSetNearNullSpace does<br>
> nothing for external solvers like hypre, right?<br>
<br>
</span>It is used by ML (smoothed aggregation), but not BoomerAMG (classical<br>
AMG) which uses an algorithm that doesn't have a natural place for such<br>
information. To my knowledge, classical AMG is not widely used for<br>
elasticity. It is very robust for M-matrices.<br>
</blockquote></div><br></div></div>