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June 2018 Update

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Ingy döt Net 2018-06-22 20:57:24 +00:00
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USING: assocs kernel math math.functions math.statistics
prettyprint sequences ;
IN: rosetta-code.entropy
: shannon-entropy ( str -- entropy )
[ length ] [ histogram >alist [ second ] map ] bi
[ swap / ] with map
[ dup log 2 log / * ] map-sum neg ;
"1223334444" shannon-entropy .
"Factor is my favorite programming language." shannon-entropy .