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I would like to understand why the zeros from my sys3 transfer function below aren't being plotted by thepzmap function.
#sys1num = [6., 0., 1.]den = [1., 3., 3., 1.]sys = control.tf(num, den)#sys2n1 = [1., 1.]n2 = [1., 2.]d1 = [1., 2.j]d2 = [1., -2.j]d3 = [1., 3.]num2 = np.convolve(n1, n2)den2 = np.convolve(d1,np.convolve(d2, d3))sys2 = control.tf(num2, den2)#sys3num3 = np.convolve(num, den2)den3 = np.convolve(den, num2)sys3 = control.tf(num3, den3)control.pzmap(sys3, Plot=True, title="Mapa de polos e zeros")Whencontrol.pzmap runs, it returns the correct poles and zeros, together with a plot. The problem is, this plot contains only the roots of the sys3 transfer function. Together with the plot, I am also getting the following warning message:
xxx/anaconda3/lib/python3.7/site-packages/control/xferfcn.py:864: ComplexWarning: Casting complex values to real discards the imaginary part num[i, j, np+1-len(numpoly):np+1] = numpoly[::-1]If the problem is the removal of the imaginary parts by that part of the algorithm, why is that happening then?