[python-control-discuss] problem with TransferFuntion.__call__ with 2D input

[Ryan K. <rk...@si...>]

I need to calculate 3D bode plots (contour plots) for my work.  I am
getting this error:

/usr/local/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/control-0.6d-py2.7.egg/control/xferfcn.pyc
in __call__(self, s)
    245         else:
    246             # SISO transfer function, return a scalar
--> 247             return self.horner(s)[0][0]
    248
    249     def _truncatecoeff(self):

/usr/local/Cellar/python/2.7.3/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/control-0.6d-py2.7.egg/control/xferfcn.pyc
in horner(self, s)
    560             for j in range(self.inputs):
    561                 out[i][j] = (polyval(self.num[i][j], s) /
--> 562                     polyval(self.den[i][j], s))
    563
    564         return out

ValueError: could not broadcast input array from shape (2,2) into shape (2)


Here is code that recreates the problem:

import control
test = control.TransferFunction(1,[1,1])
s_mat = array([[2j*pi, 3j*pi],[-0.1+2j*pi, -0.1+3j*pi]])



--
Ryan Krauss, Ph.D.
Associate Professor
Mechanical Engineering
Southern Illinois University Edwardsville