FFTEASY consists of the four C functions fftc1, fftcn, fftr1, and fftrn. FFTEASY is free. I am not in any way, shape, or form expecting to make money off of these routines. I wrote them because I needed them for some work I was doing and I'm putting them out on the Internet in case other people might find them useful. Feel free to download them, incorporate them into your code, modify them, translate the comment lines into Swahili, or whatever else you want. What I do want is the following:
Leave this notice (i.e. this entire paragraph beginning with ``FFTEASY consists of...'' and ending with my email address) in with the code wherever you put it. Even if you're just using it in-house in your department, business, or wherever else I would like these credits to remain with it. This is partly so that people can...
Give me feedback. Did FFTEASY work great for you and help your work? Did you hate it? Did you find a way to improve it, or translate it into another programming language? Whatever the case might be, I would love to hear about it. Please let me know at the email address below.
Finally, insofar as I have the legal right to do so I forbid you to make money off of this code without my consent. In other words if you want to publish these functions in a book or bundle them into commercial software or anything like that contact me about it first. I'll probably say yes, but I would like to reserve that right.
For any comments or questions you can reach me at gfelder@email.smith.edu.

Go to the FFTEASY home page or visit my home page.