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math.statistics: faster cum-mean.

db4
John Benediktsson 2013-05-06 09:12:40 -07:00
parent 0d806e0b69
commit 6a4638fa0f
1 changed files with 3 additions and 3 deletions
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basis/math/statistics/statistics.factor
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@ -339,7 +339,7 @@ ALIAS: std sample-std
: sample-corr ( {x} {y} -- corr ) 1 corr-ddof ; inline
: cum-map ( seq identity quot -- seq' )
: cum-map ( seq identity quot: ( prev elt -- next ) -- seq' )
swapd [ dup ] compose map nip ; inline
: cum-sum ( seq -- seq' )
@ -352,7 +352,7 @@ ALIAS: std sample-std
1 [ * ] cum-map ;
: cum-mean ( seq -- seq' )
[ cum-sum ] [ length [1,b] ] bi [ / ] 2map ;
0 swap [ [ + dup ] dip 1 + / ] map-index nip ;
: cum-count ( seq quot -- seq' )
[ 0 ] dip '[ _ call [ 1 + ] when ] cum-map ; inline