Documentation on Bessel function implementation?

I was wondering if there was any documentation relating to how Bessel functions (first and second kinds, modified, etc.) are implemented in Matlab? Thanks.

Answer 1

[Kirby Fears]

Have you checked out these Matlab functions?

first kind: besselj

modified first kind: besseli

second kind: besselk

[David Holmgren]

Thank you. Yes, I have looked at these, and I see that they have the definitions. However, I am aware that those expressions are not necessarily the best approaches numerically, as one has to use asymptotic formulas in for certain arguments and orders. This is what I'm curious about.