That is poor man's pivoting. The diagonal may not stay positive during factorization. Real sparse direct solves are significantly complicated by the need for dynamic pivoting. On Sep 13, 2012 3:57 PM, "John Peterson" <[email protected]> wrote:
> On Thu, Sep 13, 2012 at 2:49 PM, Paul T. Bauman <[email protected]> > wrote: > > > > This is what I do usually, but with the external packages. The internal > > PETSc lu doesn't handle pivoting. > > > http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/PC/PCLU.html > > -pc_factor_nonzeros_along_diagonal - permutes the rows and > columns to > try to put nonzero value along the diagonal. > > That's pivoting, right? > > -- > John > > > ------------------------------------------------------------------------------ > Live Security Virtual Conference > Exclusive live event will cover all the ways today's security and > threat landscape has changed and how IT managers can respond. Discussions > will include endpoint security, mobile security and the latest in malware > threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ > _______________________________________________ > Libmesh-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/libmesh-users > ------------------------------------------------------------------------------ Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://ad.doubleclick.net/clk;258768047;13503038;j? http://info.appdynamics.com/FreeJavaPerformanceDownload.html _______________________________________________ Libmesh-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/libmesh-users
