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GUI for Understanding Nyquist Plots

version (20 KB) by Erik
This is a GUI designed to help learn about Nyquist plots.


Updated 12 Oct 2011

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This program is a GUI that starts with a transfer function, and then displays the evolution of the Nyquist plot, including excursions around poles on the jw axis. It shows the path in "s" and in "G(s)H(s)" including places where the plots go to infinity (this is missing from Matlab's "nyquist" command, and can cause confusion).

When the plot is done, an explanation is given about why the system is shown to be stable or unstable.

The program is meant to me a learning tool, not a general tool for making Nyquist plots (Matlab's "nyquist" command already does that well).

Full Description at:

More information at:

As it stands the commenting is poor, but if you have problems, please contact me (

Cite As

Erik (2020). GUI for Understanding Nyquist Plots (, MATLAB Central File Exchange. Retrieved .

Comments and Ratings (4)

Andrea Bettati

Hi, thanks for the software.
Unfortunately I'm having troubles using it. I'm on Ubuntu 18.04 LTS x64, Matlab r2019a.
If I select a Transfer Function (e.g. 1/s) from the examples and hit 'start', I got a static red arrow in the plot and a Warning Dialog saying: "Large changes in L(s), plot inaccurate." Then memory usage starts to blow up with matlab taking up to 10GB and nothing happens.

jayesh balpande



MATLAB Release Compatibility
Created with R2011a
Compatible with any release
Platform Compatibility
Windows macOS Linux

Inspired: Plot Nyquist Didatic, ANP: Animated Nyquist Plot