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

Jeffrey Spencer jeffspencerd@gmail....
Wed Aug 29 06:48:57 CDT 2012


K, that makes sense. Knew it had to be backwards somewhere.
On Aug 29, 2012 8:36 PM, "Warren Weckesser" <warren.weckesser@enthought.com>
wrote:

>
>
> 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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>>
>>
>
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