On Thu, Feb 28, 2008 at 03:01:25PM +0100, Matthieu Brucher wrote:
> According to the tickets, it seems that the shift are implemented for real
> matrices, isn't it ?


There is an alternate interface
http://www.scipy.org/scipy/scipy/browser/trunk/scipy/sparse/linalg/eigen/arpack/speigs.py
that should solve the shift-invert problem for real (double) matrices.
This functionality needs to be folded into the other (arpack.py) interface and
extended to work for all matrix types.  You might be able to make it
work for you until we get to that.