[julia-users] Re: matlab vs julia slower fft

[Steven G. Johnson]

I think Matlab caches precomputed plans (FFTW "wisdom") for power-of-two 
sizes, maybe that is making the difference here.   Also, for real arrays 
Matlab might be using FFTW's real-data FFT by default.  Try it for a 
complex input array in both cases, and try it with and without precomputed 
plans in Julia.