How to plot an example for overfitting with matlab? (example image in the description)

I want to plot something similar to these three graphs

https://cdn-images-1.medium.com/max/1600/1*JZbxrdzabrT33Yl-LrmShw.png

[Star Strider]

The plots in Classify Using Discriminant Analysis (link) will get you started, specifically with the central plot. Beyond that, you will need to experiment to get the result you want for the other two.