On Mon, May 30, 2011 at 7:51 AM, Longmin RAN <longmin.ran at gmail.com> wrote:
> Dear all, > > I'm using ksp with external superlu package to solve my linear systems. The > system is sparse, real and symmetric, I'm expecting unique solution with > normal values. However, the KSPSolve returned with error 0, but the norm of > error is "1.#QNAN", and in the solution vector some values are "-1.#IND". > What does this mean ? Any help is appreciated. Thanks. > You generate a NaN somewhere. I usually check for this using norms, since NaN propagate. Check the norm of the rhs, initial solution, matrix, etc. Matt > Cheers, > > Longmin > -- 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 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20110530/9b30ed50/attachment.htm>
