A subset of non-performance-critical functions, and things like argument validation layers, are written in m code that you can read. Most of the actual work hap

A subset of non-performance-critical functions, and things like argument validation layers, are written in m code that you can read. Most of the actual work happens in obfuscated p code or calls into compiled libraries. Many of those libraries are available independently of Matlab, but you can't see how they're calling them, or important details like how the Matlab interpreter or JIT compiler work.