Re: [SciPy-User] why is GMRES slow ? [py=3.4.3 numpy=1.10 scipy=0.16]

Tue, 01 Dec 2015 21:48:27 -0300, zimon toutoune kirjoitti:

I am looking for an explanation why GMRes [scipy.sparse.linalg.gmres] running 'Niter' iterations is much more slower than applying 'Niter' times 'matvec' (or 'dot').

Each gmres outer iteration requires ~ `restart` matrix-vector products. restart=None means the default value, restart=20. The returned `info` contains the number of outer iterations.