Create matlab's equivalent to bandwidth. #690

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1. murrayrm commented on Jan 9, 2022

   

   murrayrm

   on Jan 9, 2022

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   Definitely possible, although this can also be done with the output from bode_plot and the Numpy argmin function, I suspect.

   If you (or someone) want to contribute code to do this, we can put it either in the main package or in the MATLAB compatibility module.
2. murrayrm

   added

   enhancement

   on Jan 9, 2022
3. Kreijstal commented on Jan 10, 2022

   

   Kreijstal

   on Jan 10, 2022

   Last edited by Kreijstal

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   Here is roughly how I solved it for me, I don't have time for providing a pull request, but maybe someone writing the pull request can get inspired.

   import scipy
   import numpy as np
   def bandwidth(sys,dbgain=-3):
     result=scipy.optimize.root(lambda s:control.matlab.freqresp(sys,s)[0][0]-control.matlab.dcgain(sys)*10**(dbgain/20),1)
     if result.success:
       return np.abs(result.x)[0]
     else:
       raise Exception(result.message)
4. roryyorke commented on Jul 14, 2024

   

   roryyorke

   on Jul 14, 2024

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   Looks like merged #889 closes this?
5. Kreijstal commented on Jul 14, 2024

   

   Kreijstal

   on Jul 14, 2024

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   I have not used control in years, but I am happy it got solved
6. Kreijstal

   closed this as completedon Jul 14, 2024