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Editorial Team
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Asked: 2026-05-19T00:50:08+00:00

I’ve got a project that uses fftw_plan_dft_r2c_1d and fftw_plan_dft_c2r_1d from FFTW, as well as

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I’ve got a project that uses fftw_plan_dft_r2c_1d and fftw_plan_dft_c2r_1d from FFTW, as well as fftw_execute. What are the equivalent functions in KissFFT?

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  1. Editorial Team

    You need to use the real-optimised functions in kiss_fftr.h (in the tools subdirectory). Use kiss_fftr_alloc instead of setting up FFTW “plans” with fftw_plan_dft_r2c_1d and fftw_plan_dft_c2r_1d. Use kiss_fftr and kiss_fftri to do the forward/inverse transforms instead of calling FFTW’s fftw_execute. Don’t forget to call kiss_fftr_free when you’re done.

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