local mathx = require "mathx"mathx is taken from Libraries and tools for
Lua.
This is a complete math library for Lua 5.3 with the functions available in C99. It can replace the standard Lua math library, except that mathx deals exclusively with floats.
There is no manual: see the summary below and a C99 reference manual, e.g. http://en.wikipedia.org/wiki/C_mathematical_functions
mathx library:
acos cosh fmax lgamma remainder
acosh deg fmin log round
asin erf fmod log10 scalbn
asinh erfc frexp log1p sin
atan exp gamma log2 sinh
atan2 exp2 hypot logb sqrt
atanh expm1 isfinite modf tan
cbrt fabs isinf nearbyint tanh
ceil fdim isnan nextafter trunc
copysign floor isnormal pow version
cos fma ldexp rad