# [PYTHON MATRIX-SIG] FFT question

**Jim Crotinger
**
jac@gandalf.llnl.gov

*Tue, 10 Jun 1997 07:40:25 -0700*

Rob Hooft writes:
>
> real_fft : real input --> complex output, Fourier transform
> inverse_real_fft: real input --> complex output, inverse Fourier transform
Surely not. The latter is just the complex conjugate of the former -
we don't need a seperate function to compute it. Since "real fft"s
usually pack the amplitude of the highest mode (which is phaseless)
into the same complex number as the amplitude of the 0 mode, it is
useful to have an inverse (I haven't tried the Python one - I'm just
assuming that this is the way that it works).
Jim
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