scipy/scipy — pull request #259 by wa03 (2012-06-28 19:15:01+00:00)
Title: Fixed allclose call in normalize() of filter_design.py and added a test ...

Fixed signal.normlize so that the allclose() calls won't give false positives on the filter coefficients.
Unsure why b is rank-2, but for rank-1 input b arrays, nothing should be changed.

Added a unit test to compare against the same filter in MATLAB to make sure the output coefficients are the same.

Further details and explanation on Gmane:
http://thread.gmane.org/gmane.comp.python.scientific.devel/16542/