<div style="line-height:1.7;color:#000000;font-size:14px;font-family:arial"><DIV>Hello,</DIV>
<DIV> I have a problem about superlu_dis. </DIV>
<DIV> The result of Ax=b is NaN. The error information is:</DIV>
<DIV> </DIV>
<DIV> ****** Warning from MC64A/AD. INFO(1) = 2<BR>Linear solve converged due to CONVERGED_ITS iterations 1<BR>[0]PETSC ERROR: --------------------- Error Message ------------------------------------<BR>[0]PETSC ERROR: Floating point exception!<BR>[0]PETSC ERROR: Infinite or not-a-number generated in norm!<BR>[0]PETSC ERROR: ------------------------------------------------------------------------<BR>[0]PETSC ERROR: Petsc Release Version 3.2.0, Patch 7, Thu Mar 15 09:30:51 CDT 2012 <BR>[0]PETSC ERROR: See docs/changes/index.html for recent updates.<BR>[0]PETSC ERROR: See docs/faq.html for hints about trouble shooting.<BR>[0]PETSC ERROR: See docs/index.html for manual pages.<BR>[0]PETSC ERROR: ------------------------------------------------------------------------<BR>[0]PETSC ERROR: ./ex4f on a arch-linu named node4 by wang Fri Jan 4 20:48:16 2013<BR>[0]PETSC ERROR: Libraries linked from /public/soft/ddc/soft/petsc/petsc-3.2-p7/arch-linux2-c-opt/lib<BR>[0]PETS
C ERROR: Configure run at Tue Jan 1 22:23:45 2013<BR>[0]PETSC ERROR: Configure options --with-mpi-dir=/public/soft/ddc/soft/mpich2/ --download-f-blas-lapack=1 --download-hypre=1 --with-x=1 --with-debugging=0 --download-superlu_dist --download-parmetis --download-mumps --download-scalapack --download-blacs=/public/soft/ddc/soft/petsc/blacs-dev.tar.gz<BR>[0]PETSC ERROR: ------------------------------------------------------------------------<BR>[0]PETSC ERROR: VecNorm() line 167 in src/vec/vec/interface/rvector.c</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> Does it mean that the matrix is singular? Or the size of the matrix (in the project, it is 250000X250000) is too large?</DIV>
<DIV> Thanks.</DIV>
<DIV> Jim</DIV></div><br><br><span title="neteasefooter"><span id="netease_mail_footer"></span></span>