C# library to do fft and ifft?

Question

is there a free c# library to do the fast fourier transform and its inverse?

possible duplicate of [Fast fourier transform in c#](http://stackoverflow.com/questions/170394/fast-fourier-transform-in-c-sharp) — AShelly, Feb 09 '12 at 19:01
Possible duplicate of [An implementation of the fast Fourier transform (FFT) in C#](https://stackoverflow.com/questions/170394/an-implementation-of-the-fast-fourier-transform-fft-in-c-sharp) — Md Sifatul Islam, Dec 19 '17 at 07:45

score 3 · Answer 1 · answered Dec 01 '09 at 16:06

3

Both Math.NET and Aforce are based on the Exocortex.DSP library. http://www.exocortex.org/dsp

answered Dec 01 '09 at 16:06

bhouston

Exocortex.org/dsp hasn't had a release in 6 years. I wouldn't use it in an important project. – Paul Dec 02 '09 at 03:21
1

Paul since your company is selling software that competes with Exocortex DSP it would make sense that you would seed FUD about it. Not ethical, but understandable on your part. – bhouston Dec 16 '09 at 21:03
Exocortex was one of the libraries I tried before writing (and commercializing) my own C# FFT. IIRC, I didn't use it because it was buggy and very limited (only worked for a few transform sizes). – J D Feb 08 '10 at 05:09
2

Jon Harrop, as the author of Exocortex.DSP, I have to say that yes it is limited to powers of 2, but it isn't buggy. It has been deployed all over the place with a lot of success. – bhouston Feb 13 '10 at 00:07

score 2 · Accepted Answer · edited May 23 '17 at 11:48

2

I believe this is what you're looking for.

edited May 23 '17 at 11:48

Community

answered Nov 04 '09 at 20:16

DigitalNomad

Thanks m8. But you know if any of those libs make the ifft? – aF. Nov 04 '09 at 20:30
The AForge solution at the top can do both forwards and reverse FFT, which I'm guessing is the same thing? Recently used the FFT class in there in a project, and it worked good. – Will Eddins Nov 04 '09 at 20:34
Math.Net does for sure. http://mathnet.opensourcedotnet.info/doc/IridiumFFT.ashx – DigitalNomad Nov 04 '09 at 20:40
CenterSpace's NMath does inverse FFT's and forward FFT's for any input data length. – Paul Nov 30 '09 at 20:16
Math.NET only works for integral-power-of-two length inputs. – J D Feb 08 '10 at 05:17
Update: Newer Math.NET Numerics versions do support arbitrary length inputs – Christoph Rüegg Nov 27 '10 at 09:48

2 Answers2