fastapprox

Approximate and vectorized versions of common mathematical functions

The easiest way to include this in your projects is via the one big standalone header file which works with both C and C++.

Current functions:

• exponential, logarithm, and power
• lgamma and digamma
• cosh, sinh, tanh
• cos, sin, tan
• sigmoid and erf
• Lambert W

There's a Mathematica notebook which helps explain the techniques.