Matlab's button uicontrols (pushbutton and togglebutton) are basically wrappers for a Java Swing JButton object. This post describes how the
The built-in Matlab function spy has an undocumented feature (Easter egg) when it is called with no input arguments.
Matlab has several undocumented internal helper functions that can be useful on their own in some cases. This post presents
The Matlab profiler has some undocumented options that facilitate debugging memory bottlenecks and JIT (Just-In-Time Java compilation) problems.