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Eigen (C++ library): Difference between revisions
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==Unsupported== | ==Unsupported== | ||
===FFT=== | ===FFT=== | ||
https://eigen.tuxfamily.org/dox/unsupported/group__FFT__Module.html | https://eigen.tuxfamily.org/dox/unsupported/group__FFT__Module.html<br> | ||
This uses either | https://gitlab.com/libeigen/eigen/-/blob/master/unsupported/Eigen/FFT?ref_type=heads<br> | ||
https://eigen.tuxfamily.org/index.php?title=EigenFFT<br> | |||
This uses either kissfft (default), fftw, Intel oneMKL, or pocketFFT under the hood. | |||
There is very little documentation on this so it's easier to just read the code: | |||
<syntaxhighlight lang="cpp"> | |||
// Initialize standard FFT. | |||
Eigen::FFT<double> fft; | |||
// Initialize RFFT | |||
Eigen::FFT<double> fft(Eigen::FFT<double>::impl_type(), Eigen::FFT<double>::HalfSpectrum); | |||
// Do the actual FFT or RFFT. | |||
std::vector<double> my_data = {1.0, 2.0, 3.0, 4.0}; | |||
std::vector<std::complex<double>> fft_result; | |||
fft.fwd(fft_result, my_data); | |||
// Inverse | |||
fft.inv(my_data, fft_result); | |||
</syntaxhighlight> | |||
'''Notes''' | |||
* Alternative backend implementations can be set with <code>EIGEN_FFTW_DEFAULT</code>, <code>EIGEN_MKL_DEFAULT</code>, <code>EIGEN_POCKETFFT_DEFAULT</code> | |||
* <code>fwd2</code> and <code>inv2</code> is available on the non-default backends. | |||