Re: [eigen] Using SparseLU to calculate the determinant.

[Désiré NUENTSA WAKAM <desire.nuentsa_wakam@xxxxxxxx>]

A simple approach is to set  a flag before the analyze/factorize phase 
to let the solver compute the left and right diagonal matrices Dr and Dc 
matrices. Something like
SparseLU<MatrixType> lu;
lu.setEquil(boolean); // set the flag to compute or not  the scaling 
matrices
lu.compute (A); // Compute PrDrADcPc  = LU where Pr and Pc are the row 
and column permutations.
....
Desire

On 04/15/2013 07:25 PM, Gael Guennebaud wrote:
> Do you have an idea to add balancing to SparseLU (API-wise)? We should
> make sure whether this can be easily added without breaking the API or
> requiring a new class.
>
> gael
>
> On Mon, Apr 15, 2013 at 5:52 PM, Desire NUENTSA
> <desire.nuentsa_wakam@xxxxxxxx>  wrote:
> > Hi,
> > Please, find a feature request at
> > http://eigen.tuxfamily.org/bz/show_bug.cgi?id=588
> > with a patch to do that.
> > In my opinion, We should add a feature to balance the matrix before pushing
> > the patch.
> >
> > Nuentsa W.
> >
> >
> > On 04/13/2013 05:39 PM, Joseph Maestri wrote:
> >
> > Hi,
> >
> > Decided to email this since SparseLU is in 3.2.0-beta1.
> >
> > Currently, calculating the determinant of a sparse matrix can be achieved
> > using the SparseCholesky module. Is there a plan to extend this
> > functionality to the SparseLU module? Not sure how trivial this is since I
> > have not looked into the specifics of the implementation and how the
> > factorisation is stored.
> >
> > Regards,
> > Joseph