Re: Checking GSL for Spectroscopy

[Mark Galassi]

>      I also need to be sure that a language (e.g. GSL) [...]

Like others I'm delighted to hear of your interest in GSL, but I do need to 
point out that GSL is *not* a language -- it's a library of routines that can 
be called from various languages.  The most natural is C, but most widely used 
VHLLs have GSL bindings.

GSL's first release was in 1996, and it continues to have solid use, so you 
don't need to worry about longevity there.  And the longevity of C code is 
extreme: the C standards committee is very careful about not disrupting the 
possible use of old code.  As an example, I recently rebuilt GSL code from 20 
years ago and it required almost no effort.