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bnavigator

opened on Mar 28, 2021

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Something strange about the return shape of the frequency response. For a square 2x2 system:

sys(np.array(0.0), squeeze=False).shape
(2, 2, 1)

sys(0.0, squeeze=False).shape
(2, 2)

Originally posted with the wrong result mapping by @forgi86 in #593 (comment)

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1. bnavigator commented on Mar 28, 2021

   

   bnavigator

   on Mar 28, 2021

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   BTW, omega has to be complex.

   >>> import numpy as np
   >>> from control import rss
   >>> sys = rss(2,2,2)
   >>> sys(np.array(0.0j), squeeze=False).shape
   (2, 2, 1)
   >>> sys(0.0j, squeeze=False).shape
   (2, 2)
   

   Now I am even more confused and will stop for this Sunday evening.
2. murrayrm

   closed this as completedon Mar 28, 2021
3. murrayrm commented on Mar 28, 2021

   

   murrayrm

   on Mar 28, 2021

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   Sorry, accidentally closed.
4. murrayrm

   reopened this on Mar 28, 2021
5. forgi86 commented on Mar 29, 2021

   

   forgi86

   on Mar 29, 2021

   Contributor

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   @bnavigator as far as I can see looks like you can pass real/complex/imaginary argument. I would expect the output to be the Laplace/Z transform for ct/dt in general, but haven't really tested!
6. bnavigator

   closed this as completedin #595on Apr 1, 2021

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