[SciPy-User] Bug in freqz returning angular frequency and frequency response in backward order

Warren Weckesser warren.weckesser@enthought....
Wed Aug 29 05:35:55 CDT 2012


On Wed, Aug 29, 2012 at 12:20 AM, Jeffrey Spencer <jeffspencerd@gmail.com>wrote:

> The freqz function appears to return the frequency values and the
> frequency response backwards. Like it is supposed to return in the order
> (h,w) but it actually returns in the order (w,h).
>
> This can even be seen in the documentation here:
> http://docs.scipy.org/doc/scipy/reference/generated/scipy.signal.freqz.html
>
>

Jeff,

freqz and freqs both return (w, h), which is correct.

The mistake is in the example in the docstring for freqz.  The line:

>>> h, w = signal.freqz(b)

should be

>>> w, h = signal.freqz(b)


Warren



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