[SciPy-user] is there an easy way to extend/continuate a modulo function ?

Gary Pajer gary.pajer@gmail....
Sun Apr 15 09:10:36 CDT 2007


On 4/15/07, Stef Mientki <s.mientki@ru.nl> wrote:
> In comparing different filters, I plot the phase of the transfer function
>
>     # calculate the transfer function
>     h,w = signal.freqz ( filt_coeff[0], filt_coeff[1] )
>     # calculate the phase angle
>     w_Phase = arctan( imag(w) / real(w))
>
> Now the phase-angle "w_Phase" flips around pi/2 and -pi/2,
> which of course is logical.
> But supposse I want to continuate the phase over the pi/2 border,
> (and I know that phase at either first or last element is zero),
> is there an easy way to accomplish that ?

Take a look at numpy.unwrap()
Sounds like what you want.
>
> thanks,
> Stef Mientki
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