Can you provide a code snippet that generates both errors? Thanks.

Hi Murray,
The control package is 0.7.0.
A simple test code used,

tf = control.TransferFunction([1,1],[1,1,1])
control.pzmap(tf)

It reports,

TypeError Traceback (most recent call last)
in ()
1 tf = control.TransferFunction([1,1],[1,1,1])
----> 2 control.pzmap(tf)
3 # control.matlab.pzmap(tf)
4 # pole, zero = control.matlab.pzmap(tf_mindist)
5 plt.show()
TypeError: 'module' object is not callable

control.matlab.pzmap(tf) is working fine except that zeros are not shown.
In pzmap file,

if len(zeros) > 0:
            plt.scatter(real(zeros), imag(zeros), s=50, marker='o', facecolors='none')

The zeros are shown after removing facecolors setting.

It seems the 2 pzmap functions are essentially the same one. Sorry I'm not coder and can't digg too much.

Thanks very much.

so, completing the example from above to include necessary imports and the show command, we have

import matplotlib.pyplot as plt
import control

tf = control.TransferFunction([1,1],[1,1,1])
control.pzmap(tf)
plt.show()

I am able to reproduce the reported behavior of missing zero markers. My hypothesis is some previous version of Matplotlib included marker edges by default, so facecolors='none' was sufficient to cause circle outlines. One way to achieve it now is

if len(zeros) > 0:
    plt.scatter(real(zeros), imag(zeros), s=50, marker='o',
                facecolors='none', edgecolors='g')

regarding the TypeError exception, I was not able to produce the error using the tip of master branch, whereas I can reproduce the error using the previous release version 0.7.0.

@Fankbai context?

@slivingston

def polezero(): 
        h= control.tf([2.27612463, -3.07696238,  2.10964293, -0.83921913],[1])
        b = pzmap(h)	
	plt.show()
polezero()

PR #193 addresses it

Fixed in PR #193.