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-rw-r--r--fft.txi34
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-@code{(require 'fft)}
-@ftindex fft
-
-
-@defun fft array
-
-@var{array} is an array of @code{(expt 2 n)} numbers. @code{fft}
-returns an array of complex numbers comprising the
-@dfn{Discrete Fourier Transform} of @var{array}.
-@cindex Discrete Fourier Transform
-@end defun
-
-
-@defun fft-1 array
-
-@code{fft-1} returns an array of complex numbers comprising the
-inverse Discrete Fourier Transform of @var{array}.
-@end defun
-
-@noindent
-@code{(fft-1 (fft @var{array}))} will return an array of values close to
-@var{array}.
-
-@example
-(fft '#(1 0+i -1 0-i 1 0+i -1 0-i)) @result{}
-
-#(0.0 0.0 0.0+628.0783185208527e-18i 0.0
- 0.0 0.0 8.0-628.0783185208527e-18i 0.0)
-
-(fft-1 '#(0 0 0 0 0 0 8 0)) @result{}
-
-#(1.0 -61.23031769111886e-18+1.0i -1.0 61.23031769111886e-18-1.0i
- 1.0 -61.23031769111886e-18+1.0i -1.0 61.23031769111886e-18-1.0i)
-@end example