[lindbergh]

Yes Excel lately is turning into a really compelling product, using functions such as sequence (dynamic arrays), lambda (pure functions) and let (defining sub-variables). You'd think you're coding in a pure functional language, and that's great! Now, ff only Excel had a convolution function! But nonetheless it's a great GUI, everybody knows how to use it and sharing it is dead simple.

The one downside I can find is the lack of a good plotting library. And yes comments as well is something I miss a lot.

[occamrazor]

I have implemented a convolution (using radix-2 FFT) as an intermediate step in Bluestein FFT.

Look in the source of: https://github.com/altomani/XL-FFT

[lindbergh]

Oh wow that's really impressive. Thanks a lot !