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math.extras: cleanup duplicate code.

db4
John Benediktsson 2013-04-22 11:13:32 -07:00
parent cead10cfb6
commit e3c5b53610
1 changed files with 8 additions and 7 deletions
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extra/math/extras/extras.factor
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@ -123,23 +123,24 @@ PRIVATE>
] curry map
] if ;
: 2pi-range ( n -- seq )
[ iota ] [ 1 - 2pi swap / ] bi v*n ;
: hanning ( n -- seq )
dup 1 <= [ 1 = [ 1 1array ] [ { } ] if ] [
[ iota ] [ 1 - 2pi swap / ] bi v*n
[ cos -0.5 * 0.5 + ] map!
2pi-range [ cos -0.5 * 0.5 + ] map!
] if ;
: hamming ( n -- seq )
dup 1 <= [ 1 = [ 1 1array ] [ { } ] if ] [
[ iota ] [ 1 - 2pi swap / ] bi v*n
[ cos -0.46 * 0.54 + ] map!
2pi-range [ cos -0.46 * 0.54 + ] map!
] if ;
: blackman ( n -- seq )
dup 1 <= [ 1 = [ 1 1array ] [ { } ] if ] [
[ iota ] [ 1 - 2pi swap / ] bi v*n
[ [ cos -0.5 * ] map ] [ [ 2 * cos 0.08 * ] map ] bi
v+ 0.42 v+n
2pi-range [
[ cos -0.5 * ] [ 2 * cos 0.08 * ] bi + 0.42 +
] map
] if ;
: nan-sum ( seq -- n )