[Dune] Least-squares solver for noninvertible matrix in iSTL

[Sacconi, Andrea]

Hi DUNErs,

I need to solve a least squares problem, for an operator which is non-invertible and in general non-symmetric. I would like to use a parallel QR iterative solver, but I think that it's not been implemented yet in dune-ISTL.
Am I correct? 
Is there maybe someone who is currently working on this problem?

Cheers,
Andrea
__________________________________________________________

Andrea Sacconi
PhD student, Applied Mathematics
AMMP Section, Department of Mathematics, Imperial College London,
London SW7 2AZ, UK
a.sacconi11 at imperial.ac.uk