[SciPy-Dev] Composability of LTI objects

[Ilhan Polat]

Hi Tobin,

It is mostly blocked by certain legacy behaviors. We discussed a few times
the status of the control-ish parts of signal and the majority feels like
people should probably be better off with python-control, harold, or
whatever else specialized package seems to be suitable for their workflow.

This is not to say that we gave up on the LTI objects and that part of the
signal but the wiggle room is indeed quite limited for new features.


Disclosure: I am the author of harold but I am not finding too much time
lately for a new version which is long overdue

On Wed, Apr 21, 2021 at 12:32 AM Tobin Fricke <fricke at gmail.com> wrote:

> Hi SciPy-devs,
>
> I recently began working with LTI objects in SciPy, and was surprised to
> discover that objects like scipy.signal.TransferFunction do not appear to
> be composable. I would like to be able to compose two transfer functions
> with addition, or indicate the series combination of a TransferFunction
> object with a ZerosPolesGain object using the * operator.
>
> Is there a reason this feature has not been pursued? If not, I would be
> happy to work on it.
>
> thanks,
> Tobin
>
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