unmaintained: removing old math.transforms.fft.

unmaintained/math/transforms/fft/authors.txt

@@ -1 +0,0 @@
-Hans Schmid

unmaintained/math/transforms/fft/fft-docs.factor

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-USING: help.markup help.syntax sequences ;
-IN: math.transforms.fft
-
-HELP: fft
-{ $values { "seq" sequence } { "seq'" sequence } }
-{ $description "Fast Fourier transform function." } ;
-

unmaintained/math/transforms/fft/fft.factor

@@ -1,38 +0,0 @@
-! Copyright (c) 2007 Hans Schmid.
-! See http://factorcode.org/license.txt for BSD license.
-USING: columns grouping kernel math math.constants math.functions math.vectors
-    sequences ;
-IN: math.transforms.fft
-
-! Fast Fourier Transform
-
-<PRIVATE
-
-: n^v ( n v -- w ) [ ^ ] with map ;
-
-: omega ( n -- n' )
-    recip -2 pi i* * * exp ;
-
-: twiddle ( seq -- seq' )
-    dup length [ omega ] [ n^v ] bi v* ;
-
-PRIVATE>
-
-DEFER: fft
-
-: two ( seq -- seq' )
-    fft 2 v/n dup append ;
-
-<PRIVATE
-
-: even ( seq -- seq' ) 2 group 0 <column> ;
-: odd ( seq -- seq' ) 2 group 1 <column> ;
-
-: (fft) ( seq -- seq' )
-    [ odd two twiddle ] [ even two ] bi v+ ;
-
-PRIVATE>
-
-: fft ( seq -- seq' )
-    dup length 1 = [ (fft) ] unless ;
-

unmaintained/math/transforms/fft/summary.txt

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-Fast fourier transform