Inclusion of base/special functions about specialfunctions.jl

[ararslan]

Surely we can't be taking everything in base/special. Not having log in Base would be heresy.

[tkelman]

I think Faddeeva's actually C++, not Fortran? We can certainly leave log in Base, but we can also do one thing at a time. Airy and Bessel can probably move here first.

[ararslan]

Huh, could have sworn it was Fortran but it looks like you're right, it's C++. And Julia's own Steven G. Johnson wrote it, no less! 😄

Yeah, I figured we wouldn't do all of it at once. Bessel and airy sounds like a good place to start. I'd still like to rewrite (or at least refactor) the translated Julia code from AMOS to be more idiomatic, it just requires the mental gymnastics of following gotos.

Hopefully moving the tests from Base will help increase the currently abysmal coverage.

[ararslan]

I'll start a checklist here of stuff to copy over based on my understanding of the plan. Feel free to add/subtract at will.

• Airy
• Bessel
• Higher-order gamma functions (digamma et al.)
• Error functions
• Gamma, beta, zeta