[SciPy-user] modified bessel function of the 2nd/3rd kind

Pauli Virtanen pav@iki...
Mon Sep 8 13:59:05 CDT 2008


Sun, 07 Sep 2008 19:18:56 -0700, David Strozzi wrote:
> Folks,
> 
> scipy.special contains these Bessel functions:
> 
> Bessel Functions
> ----------------
[clip]
> 
> As has been noted on this list before, kn, kv are also, in fact much
> more commonly, referred to as mod. Bess. funcs of the *2nd* kind.  Can
> this info please be updated?  Is there any good reason not to have the
> help message say "of the second kind (sometimes called the third kind)"?
> 
> As someone who works with these I have never heard them called the 3rd
> kind, only the 2nd.

Changed in r4704; "of the third kind" seems to be some kind of historical 
remnant that's rarely used today.

-- 
Pauli Virtanen



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