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Just a small note today for the case you need to draw an error ellipse from a covariance matrix some day in machine learning

How to plot a covariance error ellipse • Code is poetry A mathematical derivation on how to plot a covariance error ellipse in Matlab and JavaScript

The next piece of the big puzzle I'm working on is here: A game controller library for node.js!

Using Gamepads in JavaScript via node.js • Code is poetry A node.js library to work with Sony PlayStation controllers, Microsoft XBOX controllers SNES or a bunch of other controllers