Hi Federico, Some days after posting it in beginning of Sept, I found it out. Maybe I can improve the doc in October or provide a conversion function for scipy.sparse.dia And I were also digging in the Python-Code but it only wraps the Fortran-Function, and the Fortran help itself also is very qiet. Sebastian Von: scipy-user-bounces@scipy.org [mailto:scipy-user-bounces@scipy.org] Im Auftrag von federico vaggi Gesendet: Mittwoch, 18. September 2013 16:18 An: scipy-user@scipy.org Betreff: Re: [SciPy-User] solve_banded usage (once again) (Wagner Sebastian) Hey Wagner, not sure how helpful this is, but if you dig into the SciPy source code, you'll see that solve_banded is a fairly thin wrapper around the gbsv function from lapack. If you go look at the lapack source code: http://software.intel.com/sites/products/documentation/hpc/mkl/mklman/GUID-3... You can get a better idea of the parameters there. Not sure if this is helpful - I've never really had to use that function myself, but at least it might give you some pointers. Federico