Re: replacement of CXSPARSE by SPQR

[Marco Caliari]

Hi Simon,

have you seen

https://savannah.gnu.org/bugs/?51950

Does your code fix that problem?

Marco


On Fri, 19 Jul 2019 12:32:41 +0200
Simon Hau <address@hidden> wrote:

> Hello Kai,
> 
> yes, I would like to work on this project. I replaced the CXSPARSE
> function calls in the sparse_qr_rep-constructor and in the R- and
> Q-methods by the corresponding SPQR function calls (for the
> REAL-case). I tested those changes by starting Octave with the
> run-octave-script and calling [Q,R] = qr(A). It seems to work.
> Nevertheless I am newbie to C++ and I have only a basic undestanding
> of (sparse) numerical linear algebra. So I can't give any guaratees
> about the time I will need to replace all CXSPARSE functionality.
> Maybe I will have to ask some questions in this mailing list if I
> don't know what to do next.
> 
> Simon
> 
> Am Fr., 19. Juli 2019 um 07:37 Uhr schrieb Kai Torben Ohlhus <
> address@hidden>:  
> 
> > On 7/19/19 7:23 AM, Simon Hau wrote:  
> > > Hello,
> > >
> > > I have a question concerning the Open-Projects-List
> > > (https://wiki.octave.org/Projects). Is there still a need for
> > > replacing CXSPARSE by SPQR?
> > >
> > > Regards
> > >
> > > Simon  
> >
> > Dear Simon,
> >
> > AFAIK Octaves development branch still uses CXSPARSE for the
> > QR-factorization of sparse matrices:
> >
> >
> >
> > https://hg.savannah.gnu.org/hgweb/octave/file/378d3c91f85b/liboctave/numeric/sparse-qr.cc
> >
> > Do you want to work on this project?
> >
> > Kai
> >  



-- 
Dr. Marco Caliari
Dipartimento di Informatica
Universita` degli Studi di Verona
Secondo piano, 2.03
Ca' Vignal 2
Strada le Grazie 15
37134 VERONA

tel: +39 045 802 7904
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