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Which fast Fourier transform (FFT) package does Elk use?

April 26, 2017elk fast FFT fourier package transform

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Which fast Fourier transform (FFT) package does Elk use?

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It uses a modified version of FFTPACK5. This is a highly efficient implementation of an in-place N-dimensional complex FFT. However you can easily replace this with your own machine-optimised FFT package. See the routine zfftifc for details.