Entropy/Narcissist: Difference between revisions
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<pre>Entropy of file "src/EntropyNarcissist.java" = 4.691381977073.</pre>
=={{header|jq}}==
'''Works with jq, the C implementation of jq'''
'''Works with gojq, the Go implementation of jq'''
'''Works with jaq, the Rust implementation of jq'''
The program assumes it will be presented to itself using
an invocation of jq with the -sR options, along the lines of:
<pre>
jq -sR -f entropy-narcissist.jq < entropy-narcissist.jq
</pre>
If your jq supports `keys_unsorted`, feel free to use it instead of `keys`.
<syntaxhighlight lang="jq">
def chars: explode[] | [.] | implode;
def bow(stream):
reduce stream as $word ({}; .[($word|tostring)] += 1);
def sum(s): reduce s as $x (0; .+$x);
length as $l
| bow(chars)
| sum(keys[] as $k | .[$k] as $c | $c * ($c|log2) )
| ($l|log2) - ./$l
</syntaxhighlight>
{{output}}
<pre>
{{output}}
<pre>
4.796499915496963
</pre>
=={{header|Julia}}==
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