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I have step responses that go negative and sometimes stay negative, and it breaks the settling time calculation and rise time calculation. I've been messing around with it and might open a pull request if this is something y'all would be interested in.
For example, here is my code, the step response plot, and the error
fromcontrolimporttf,step_response,step_infoimportmatplotlib.pyplotaspltimportnumpyasnptransfer_function=tf( [3.32,0,-162.8], [1,24.56,186.5,457.8,116.2] )time,response=step_response(transfer_function)fig,ax=plt.subplots(1,1)ax.plot(time,response)plt.show()step_info(transfer_function)
step_info() gives the following error
Traceback (most recent call last): File "bug_test.py", line 14, in <module> step_info(transfer_function) File "/Users/hgducharme/Programming/pendulum/env/lib/python3.7/site-packages/control/timeresp.py", line 536, in step_info SettlingTime = T[i + 1]IndexError: index 1000 is out of bounds for axis 0 with size 1000When I run this code in MATLAB, I get the following result
