A lightweight C# wrapper for native FFTW.
- Unmanaged function calls to main FFTW functions for both single and double precision
- Basic managed wrappers for FFTW plans and unmanaged arrays
- Test program that demonstrates basic functionality
The binaries provided for download on the official website https://www.fftw.org/install/windows.html are outdated (version 3.3.5, last checked January 2023). If you are looking for up-to-date FFTW windows binaries, try conda or my personal package site.
The FFT benchmark fftbench compares a selection of managed libraries (Accord, Exocortex, Lomont, MathNet, NAudio, NWaves) with FFTW. The benchmark was originally written for a CodeProject article Comparison of FFT Implementations for .NET. Here's an example output. The first column displays the relative speedup (slowdown) compared to Exocortex:
FFT size: 2^12 (4096)
Repeat: 80
[13/13] Done
FFTWF (real): 0.2 [min: 13.07, max: 23.09, mean: 13.91, stddev: 1.58]
FFTW (real): 0.3 [min: 22.45, max: 29.72, mean: 23.13, stddev: 1.16]
FFTW: 0.6 [min: 44.38, max: 54.68, mean: 46.08, stddev: 2.33]
Exocortex (real): 1.0 [min: 73.41, max: 87.08, mean: 74.40, stddev: 1.71]
Lomont (real): 1.2 [min: 83.59, max: 145.93, mean: 91.67, stddev: 8.83]
NWaves (real): 1.6 [min: 108.90, max: 134.05, mean: 121.49, stddev: 5.93]
NWaves: 1.8 [min: 131.83, max: 160.96, mean: 133.78, stddev: 3.88]
Lomont: 2.2 [min: 161.74, max: 179.24, mean: 165.22, stddev: 3.96]
NAudio: 2.3 [min: 165.75, max: 302.79, mean: 169.82, stddev: 15.28]
Exocortex: 2.4 [min: 171.52, max: 193.15, mean: 175.00, stddev: 4.60]
AForge: 3.1 [min: 224.57, max: 264.78, mean: 228.89, stddev: 5.33]
Accord: 4.0 [min: 286.49, max: 352.00, mean: 298.92, stddev: 12.66]
Math.NET: 4.9 [min: 331.12, max: 441.35, mean: 360.87, stddev: 17.33]
Timing in microseconds.
One of the earliest .NET open-source FFT projects and - as the benchmark confirms - still one of the best performing. The copy provided here was updated to .NET standard 2.0 and uses the System.Numerics.Complex type. Exocortex.DSP is distributed under the BSD license.
