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Showing content from https://github.com/python-control/python-control/issues/165 below:

Can't step a zero degree polynomial · Issue #165 · python-control/python-control · GitHub

When running:

import control as ctrl
G = ctrl.tf([1],[1])
(y, t) = ctrl.step(G)

I get this error (I get the same in python 2.7 and 3.5):

Traceback (most recent call last):
File "./prueba.py", line 10, in
(y, t) = ctrl.step(G)
File "/usr/local/lib/python3.5/dist-packages/control/matlab.py", line 1328, in step
transpose = True, **keywords)
File "/usr/local/lib/python3.5/dist-packages/control/timeresp.py", line 483, in step_response
sys = _get_ss_simo(sys, input, output)
File "/usr/local/lib/python3.5/dist-packages/control/timeresp.py", line 409, in _get_ss_simo
sys_ss = _convertToStateSpace(sys)
File "/usr/local/lib/python3.5/dist-packages/control/statesp.py", line 656, in _convertToStateSpace
ssout = td04ad('R',sys.inputs, sys.outputs, index, den, num,tol=0.0)
File "/usr/local/lib/python3.5/dist-packages/slycot/transform.py", line 423, in td04ad
out = _wrapper.td04ad_r(m,p,index,dcoeff,ucoeff,n,tol,ldwork)
ValueError: failed to create intent(cache|hide)|optional array-- must have defined dimensions but got (1,0,)


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