Hi, the overshoot calculate by step_info function is wrong for this transfer function:

import control as ctrl #control 0.8.3import matplotlib.pyplot as plt #matplotlib 3.2.2transferFunction = ctrl.tf([0.6287,37.74,774.4,5797,7515],[1.629,45.74,788.4,5809,7515])time, out = ctrl.step_response(transferFunction)plt.figure()plt.grid()plt.plot(time, out)

ctrl.step_info(transferFunction)

{'RiseTime': 0.051990934709959705,
'SettlingTime': 0.4289252113571676,
'SettlingMin': 0.9121688025464874,
'SettlingMax': 1.1826717168233585,
'Overshoot': 29.748622946474416,
'Undershoot': 0.3859422958870473,
'Peak': 1.1826717168233585,
'PeakTime': 0.13430991466739592,
'SteadyStateValue': 0.9999984629917944}