In article <5net75$q2f at kew.globalnet.co.uk>,
aida at globalnet.co.uk (Dr. Eldon D. Lehmann) writes:
>> I am looking for some public domain source code for performing fast
> fourier transforms and/or spectral analysis for a medical application.
> A pointer to a software library would be very much appreciated.
Try "Numerical Recipes in [C Pascal Fortan ...]" by Press, Flannery,Teukolsky,
and Vetterling Cambridge University Press.
All you need, and quite well explained.