math functions to move to SpecialFunctions.jl

[StefanKarpinski]

• lgamma
• gamma
• lfact
• beta
• lbeta

[ViralBShah]

Sounds good. Where should they go?

[JeffBezanson]

SpecialFunctions.jl?

[StefanKarpinski]

[l]gamma and [l]beta should likely go in https://github.com/JuliaMath/SpecialFunctions.jl with the rest of the *gamma functions. lfact should probably be called lfactorial and live there as well, largely because it's implemented in terms of the lgamma function.

[dpsanders]

Or better loggamma, logfactorial etc.

[StefanKarpinski]

The lfunction convention is pretty standard but sure. We could also do log(gamma)(x)... not entirely sure if ing or not...

[dpsanders]

log(gamma) is a neat idea.

[alanedelman]

+1 on log(gamma)

[freeboson]

FWIW, they're called lbeta, lgamma in R and Tensorflow

[StefanKarpinski]

I do think that lbeta, lgamma, lfactorial and lbinomial are fine names.

[ararslan]

log(gamma) is a fun idea in theory but you then lose the ability to sensibly overload lgamma, since log(gamma) would then return an anonymous function.