Coyote's Guide to IDL Programming

Comparison of the IDL FFT Function

QUESTION: What's up with the IDL FFT function? I don't get the same results as when I use my FORTRAN FFT function.

ANSWER: Paul van Delst at the University of Wisconsin has written up a nice set of notes on how to use the IDL FFT routine correctly. Point your browser to this URL, turn your image downloading on, and be prepared to wait just a couple of minutes while the page downloads. The images are what you want to see, and the explanation is bang on.

Web Coyote's Guide to IDL Programming