Did you call MatAssemblyBegin/End()? Matt
On Tue, Apr 19, 2016 at 5:51 AM, 丁老师 <[email protected]> wrote: > Dear friends: > I am receiving error about " not for unassembled matrix" > > > > > > -- What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead. -- Norbert Wiener
