<div class="gmail_quote">On Sun, Nov 13, 2011 at 16:36, Barry Smith <span dir="ltr"><<a href="mailto:bsmith@mcs.anl.gov">bsmith@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;">
<div id=":45p">1) It is legitimate to call KSPSetOperators with a null Amat so this is a bug that crashes large parts of PETSc<br></div></blockquote><div><br></div><div>This logic should be moved much later (like to KSPSetUp()).</div>
<div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div id=":45p">
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2) Do you really want to do this? I am not sure I like it.<br></div></blockquote></div><br><div>I think that attaching the null space to the Mat should be the preferred way to communicate it, especially in the case of a deeply nested hierarchy.</div>