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sisotool(sys) isn't ploting#770

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eletroinf asked this question inQ&A
Sep 14, 2022· 2 comments· 1 reply
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Hello
I'm trying python control, starting with the examples.
With this simple example:

from control.matlab import *
sys = tf([1000], [1,25,100,0])
sisotool(sys)

Located athttps://python-control.readthedocs.io/en/latest/generated/control.sisotool.html
What I understand is that it should generate a plot, but when I run the code from a python terminal nothing happens.
Running it from Anaconda spyder it generates a figure plot, what I think it is the correct behavior.

It wouldn't generate a figure when running in a terminal? (I'm using windows)

Regards
Ricardo

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Replies: 2 comments 1 reply

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Hi,

Did you set up your interactive terminal to plot Matplotlib figures?
https://matplotlib.org/stable/users/explain/interactive.html

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1 reply
@eletroinf
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Hi,
I'm trying to understand what you mean, but for me it doesn't make sense. pytplot isn't even imported in the example code. I think it is imported inside the control library. Documentation doesn't mention that it is needed to set pyplot.

Thank you anyway

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Hi all,
Just to close this issue, today I worked on it. One solution to this code to work is import pyplot and use the function plt.show() at the end.
By doing this, it will show a picture (I'm using Python 3.11).

import matplotlib.pyplot as plt
from control.matlab import *

sys = tf([1000], [1,25,100,0])
sisotool(sys)

plt.show()

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