Picomath

The Picomath project holds some reusable math functions inspired by John D. Cook's Stand-alone code for numerical computing, including:

• Error function
• Phi (standard normal CDF)
• Phi inverse
• Gamma
• Log Gamma
• exp(x) - 1 (for small x)
• log(n!)

These functions are implemented in an impressive list of languages: Ada, C++, C#, D, Erlang, Go, Haskell, Java, Javascript, Lua, Pascal, Perl, PHP, Python (2.x and 3.x), Ruby, Scheme, and Tcl.

And now Factor!

You can find the code (and a bunch of tests) for this on my Github.