<div class="gmail_quote">On Mon, Apr 2, 2012 at 07:44, Jed Brown <span dir="ltr"><<a href="mailto:jedbrown@mcs.anl.gov">jedbrown@mcs.anl.gov</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
The block size is used if you don't provide any other information. The preferred approach with petsc-dev is to use MatSetNearNullSpace(). (I'll make sure this is currently working with ML and reply to this message.)</blockquote>
</div><br><div>I pushed ML support for user-provided null spaces to petsc-dev. Call MatSetNearNullSpace() to provide the information. You can use MatNullSpaceCreateRigidBody() if you have nodal coordinates.</div><div><br>
</div><div><br></div><div>Mark, what is the best way to make PCGAMG use this interface?</div>