[SciPy-user] Matrix sign function

[Pearu Peterson]

On Wed, 24 Sep 2003, Nils Wagner wrote:

> It would be nice to have the matrix sign function in scipy.

Try the following:

  signm=lambda a:linalg.funm(a,lambda v:sign(v)+0j)

This assumes that `a` has real eigenvalues. Otherwise one most use some
other sign function that is properly defined for complex values, the
current sign is acctually 
  v |-> sign(real(v))

Pearu