New extension for Associated Legendre Functions (ALFs)

[Brian Gough]

At Mon, 16 Mar 2009 15:31:37 -0600,
Patrick Alken wrote:
>   Most current implementations of associated Legendre functions
> (ALFs), including the current GSL version fail due to underflow
> above degree and order (L,M) 1900.  A 2002 paper by Holmes and
> Featherstone shows that with a very simple scaling modification
> this limit can be extended to 2700 in double precision. I have
> recently needed to compute high degree ALFs so I have implemented
> their algorithm and made a new GSL extension if others are interested.

Great work!

Incidentally, I found a copy of their paper online at
http://www.cage.curtin.edu.au/~geogrp/research.html
http://www.cage.curtin.edu.au/~will/20760279.pdf

-- 
Brian Gough