• Raymond Toy's avatar
    Add and update some comments. · 796624d9
    Raymond Toy authored
    Add warning that rfft and cfft have different definitions for the
    forward transform.  The sign of the exponential is different.  I do
    not know why.
    Note that the documentation from FFTPACK51 has the same issue with the
    additional issue that the CFFT is not normalized by N whereas the RFFT
fftpack5-double.lisp 10.7 KB