Re: [Help-gsl] (no subject)

[Brian Gough]

mick writes: I am looking for a routine calculating the Legendre
 > function P_l(x) for non-integer (i.e. real) "l" in general. I went
 > through the gsl library where I was able to find the standard
 > Legendre polynomials (i.e. integer l and m) in "legendre_poly.c" or
 > more sophisticated functions like the conical functions
 > (P^{-mu}_{-1/2 + I tau}) in "legendre_con.c" but I couldn't find a
 > routine for general (real) "l". Is it too difficult to calculate it? 
 > Or am I able to calculate it starting from the "basic" functions
 > already existing in the gsl library ?

GSL doesn't have it, guess it is too complicated.
Try the relation in Abramowitz & Stegun 8.1.2 though.

-- 
Brian Gough
(GSL Maintainer)

Network Theory Ltd,
Commercial support for GSL --- http://www.network-theory.co.uk/gsl/