<div class="gmail_quote">On Fri, Jan 27, 2012 at 02:43, Klaij, Christiaan <span dir="ltr"><<a href="mailto:C.Klaij@marin.nl">C.Klaij@marin.nl</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
[0]PETSC ERROR: Unhandled case, must have at least two fields!</blockquote></div><br><div>You can use PCFieldSplitSetIS(). The implementation could check whether a MatNest is being used and automatically set the splits if it is, but you would have to call PCFieldSplitSetIS() later when you wanted to assemble into an AIJ format, so I'm hesitant to pick it up automatically. Just call the function for now.</div>