pzmap vs pzplot vs zplane?

What is difference between these three?pzmap vs pzplot vs zplane?

Answer 1

[Star Strider]

The pzmap and pzplot funcitons are part of the Control System Toolbox (and associated Toolboxes), with pzplot being an extended version of pzmap with more plot options. Both can handle either continuous or discrete systems.

The zplane function is part of the Signal Processing Toolbox and presents similar information, however in a completely different context and a completely different syntax. It can only handle discrete transfer functions.