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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
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6
Task/Entropy/Groovy/entropy-1.groovy Normal file
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String.metaClass.getShannonEntrophy = {
-delegate.inject([:]) { map, v -> map[v] = (map[v] ?: 0) + 1; map }.values().inject(0.0) { sum, v ->
def p = (BigDecimal)v / delegate.size()
sum + p * Math.log(p) / Math.log(2)
}
}

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Task/Entropy/Groovy/entropy-2.groovy Normal file
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[ '1223334444': '1.846439344671',
'1223334444555555555': '1.969811065121',
'122333': '1.459147917061',
'1227774444': '1.846439344671',
aaBBcccDDDD: '1.936260027482',
'1234567890abcdefghijklmnopqrstuvwxyz': '5.169925004424',
'Rosetta Code': '3.084962500407' ].each { s, expected ->
println "Checking $s has a shannon entrophy of $expected"
assert sprintf('%.12f', s.shannonEntrophy) == expected
}