Entropy/Narcissist: Difference between revisions
Added Kotlin
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'''Example''':<lang j> load 'entropy.ijs'
4.73307</lang>
=={{header|Kotlin}}==
<lang scala>// version 1.1.0 (entropy_narc.kt)
fun log2(d: Double) = Math.log(d) / Math.log(2.0)
fun shannon(s: String): Double {
val counters = mutableMapOf<Char, Int>()
for (c in s) {
if (counters.containsKey(c)) counters[c] = counters[c]!! + 1
else counters.put(c, 1)
}
val nn = s.length.toDouble()
var sum = 0.0
for (key in counters.keys) {
val term = counters[key]!! / nn
sum += term * log2(term)
}
return -sum
}
fun main(args: Array<String>) {
val prog = java.io.File("entropy_narc.kt").readText()
println("This program's entropy is ${"%18.16f".format(shannon(prog))}")
}</lang>
{{out}}
<pre>
This program's entropy is 4.8471803665906705
</pre>
=={{header|Lua}}==
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