On 10/22/12 3:03 PM, Pauli Virtanen wrote: > Jason Grout <jason-sage <at> creativetrax.com> writes: > [clip] >> I think we've established that the other software mentioned does indeed >> use the spectral norm by default. I'm still curious: what was the >> reason for breaking with the norm (pun intended :)? Any chance that in >> a (probably far distant) future release, the norm default could be >> changed to conform with matlab/octave/mathematica's view of the world? >> It's not a huge deal to me now that I know to watch out for it, but it >> did just bite me and a student a few times. > > The trail leads to here: > http://projects.scipy.org/numpy/attachment/ticket/36/numpy-6-norm-change- > default.diff > > Seems like the chances of learning the reason why this change was done > are pretty slim.
Thanks for tracking this down. It looks like the default used to be the spectral norm. I guess there still is a question of if it is possible to change it back at this point. FYI, in Sage, we were following the numpy convention (default = Frobenius norm) for numerical matrices, but we are now switching the default to be the spectral norm [1]. Thanks, Jason [1] http://trac.sagemath.org/sage_trac/ticket/13643 _______________________________________________ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion
