As it stands, a function that takes zeroes, poles, gain into numerator, denominator transfer function coefficient arrays only lives inscipy.signal or can be imported fromcontrol.matlab, and used to create a transfer functionmy_tf as follows:
my_tf= tf(*zpk2tf(...))
Why not instead canpython-control have a method that directly takes zeroes, poles, gain into a transfer function, i.e.
my_tf=zpk2tf(..)?