QR factorization

Hong Zhang hzhang at mcs.anl.gov
Thu Dec 14 15:39:07 CST 2006

> >
> > does petsc currently support QR factorization?

> > I saw that it is supposedly provided by an interface to the spooles
> > package, however the comment in MatQRFactorSymbolic_SeqAIJSpooles
> > that says
> > SETERRQ(PETSC_ERR_SUP,"QR Factorization is unsupported as the Spooles
> > implementation of QR is invalid.");
> > seems to imply that it is not working.

Spooles' QR doesn't work, so we gave up our interface to it.


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