10 lines
227 B
PowerShell
10 lines
227 B
PowerShell
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function entropy ($string) {
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$n = $string.Length
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$string.ToCharArray() | group | foreach{
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$p = $_.Count/$n
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$i = [Math]::Log($p,2)
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-$p*$i
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} | measure -Sum | foreach Sum
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}
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entropy "1223334444"
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