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minor cleanup

db4
erg 2008-04-03 16:02:37 -05:00
parent 53d21c6c7a
commit d27252e232
1 changed files with 4 additions and 5 deletions
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9
extra/random/mersenne-twister/mersenne-twister.factor
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@ -15,14 +15,13 @@ TUPLE: mersenne-twister seq i ;
: mt-m 397 ; inline
: mt-a HEX: 9908b0df ; inline
: calculate-y ( y1 y2 mt -- y )
tuck
: calculate-y ( n seq -- y )
[ nth 32 mask-bit ]
[ nth 31 bits ] 2bi* bitor ; inline
[ [ 1+ ] [ nth ] bi* 31 bits ] 2bi bitor ; inline
: (mt-generate) ( n mt-seq -- next-mt )
: (mt-generate) ( n seq -- next-mt )
[
[ dup 1+ ] [ calculate-y ] bi*
calculate-y
[ 2/ ] [ odd? mt-a 0 ? ] bi bitxor
] [
[ mt-m + ] [ nth ] bi*