<div class="gmail_quote">On Wed, Mar 14, 2012 at 07:47, Matthew Knepley <span dir="ltr"><<a href="mailto:knepley@gmail.com">knepley@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div id=":3b9">I thought MatSchurComplement() made the original matrix available?</div></blockquote><div><br></div><div>Not sure what you mean. The submatrices are inside a MatSchurComplement. But the user doesn't get access to the Schur complement to set near-null spaces.</div>
<div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div id=":3b9"> I still disagree with this for<div>MatGetSubMatrix() since it will create a nightmare for references. I am still tracking down a</div>
<div>reference bug in FS when you use a custom preconditoner for Schur.</div></div></blockquote></div><br><div>FieldSplit in petsc-dev has some new bugs, Jungho is working on them.</div>