Phase-plane analysis

Graphical user interfaces called pplane and dfield for phase-plane analysis have been developed at Rice University, http://math.rice.edu/ Links to an external site., and are available for academic use.

For MATLAB 2017a, use the following versions: pplane9.m Links to an external site. and dfield9.m Links to an external site..
For MATLAB 2014b-2016b, use the following versions: pplane8.m Links to an external site. and dfield8.m Links to an external site..
If you have a newer version of MATLAB you can instead use the Java version available on 
https://www.cs.unm.edu/~joel/dfield/ Links to an external site.

Check out as well this MATLAB app for plotting phase portraits. It works with full functionality for R2020b version or newer.

https://se.mathworks.com/matlabcentral/fileexchange/81026-phase-portrait-plotter