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n! -- factor

Name: Anonymous 2007-09-14 9:02 ID:w+iUxD20


: n! ( n -- n! ) dup zero? [ drop 1 ] [ dup 1- n! * ] if ;
: ln! ( n lim -- ) over - [ dup n! . 1+ ] times drop ;

1 10 ln!
1
2
6
24
120
720
5040
40320
362880


Superior.

Name: Anonymous 2007-09-14 9:59 ID:NGyWv0ND

"memoize" require
USING: memoize math.vectors ;
MEMO: memo-* ( a b -- c ) * ;
MEMO: n! ( n -- n! ) 1+ 1 tail 1 [ memo-* ] reduce ;
: ln! ( n lim -- ) swap tail [ n! . ] each ;


Superior.

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