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IndexError: index -1 is out of bounds for axis 0 with size 0 #1014
Description
I get this:
Traceback (most recent call last):
File "C:\Users\me\PycharmProjects\f\control1.py", line 17, in <module>
S = ct.step_info(sysdata=y_out2, T=T2)
File "C:\Users\me\PycharmProjects\f\venv\lib\site-packages\control\timeresp.py", line 1614, in step_info
settled = np.where(
IndexError: index -1 is out of bounds for axis 0 with size 0
From this: (just a simple integrator TF)
import control as ct
import numpy as np
num = [0,5]
den = [1,0]
H = ct.TransferFunction(num, den)
t = np.arange(start=0, stop=2, step=1/120)
T2, y_out2 = ct.timeresp.impulse_response(sys=H, T=t)
pyplot.figure(1)
pyplot.plot(T2, y_out2)
pyplot.grid(True)
pyplot.show(block=False)
S = ct.step_info(sysdata=y_out2, T=T2)
pyplot.show()Control v0.10.0
Numpy 1.26.4
Scipy 1.14.0
Activity
NikolaiVChr commentedon Jun 27, 2024
I get same error with:
num = [1,5]
den = [1,0]
NikolaiVChr commentedon Jun 27, 2024
Oh, and thank you for great library. Its awesome.
murrayrm commentedon Jun 27, 2024
The bug is in the
step_infofunction. The impulse response for a pure integrator is a constant output andstep_infogets confused when it is passed something that doesn't look like a step response.Fixing the bug should be straightforward: we should probably issue a warning when we can't find the features we are looking for in a typical step response.
slivingston commentedon Jul 13, 2024
Fixed in #1029