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Replace nested >r r> with spread in math.statistics

db4
Aaron Schaefer 2008-11-17 18:48:19 -05:00
parent f8e86894a4
commit 6161d99637
1 changed files with 3 additions and 3 deletions
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extra/math/statistics/statistics.factor
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@ -1,7 +1,7 @@
! Copyright (C) 2008 Doug Coleman, Michael Judge.
! See http://factorcode.org/license.txt for BSD license.
USING: arrays kernel math math.analysis math.functions sequences sequences.lib
sorting ;
USING: arrays combinators kernel math math.analysis math.functions sequences
sequences.lib sorting ;
IN: math.statistics
: mean ( seq -- n )
@ -63,7 +63,7 @@ IN: math.statistics
r sq ;
: least-squares ( {{x,y}...} -- alpha beta )
[r] >r >r >r >r 2dup r> r> r> r>
[r] { [ 2dup ] [ ] [ ] [ ] [ ] } spread
! stack is mean(x) mean(y) mean(x) mean(y) {x} {y} sx sy
[ (r) ] 2keep ! stack is mean(x) mean(y) r sx sy
swap / * ! stack is mean(x) mean(y) beta