D-Programming-Language/phobos — pull request #1664 by majiang (2013-10-25 14:24:19+00:00)
Title: improve Fft comments: add description of FFT conventions

Since the sign of exponent and the factor in the formula of discrete Fourier transform is dependent on the condition, this should be documented.
Additionally, typo 'nterleaved' is fixed to 'interleaved'.