Revision as of 21:17, 28 October 2022 (view source) Cyril Nocton (talk \| contribs) (→‎Common Lisp) ← Older edit		Revision as of 00:13, 29 October 2022 (view source) Steenslag (talk \| contribs) (→‎{{header\|Ruby}}: Use tally method) Newer edit →
Line 2,914: =={{header\|Ruby}}== ~~{{works with\|Ruby\|1.9}}~~ <syntaxhighlight lang="ruby">def entropy(s) counts = ~~Hash~~s.~~new(0~~chars.0)tally leng = s.length.to_f▼ ~~s.each_char { \|c\| counts[c] += 1 }~~ ▲ leng = s.length counts.values.reduce(0) do \|entropy, count\| freq = count / leng Line 2,931 ⟶ 2,930: 1.8464393446710154 </pre> ~~One-liner, same performance (or better):~~ ~~<syntaxhighlight lang="ruby">def entropy2(s)~~ ~~s.each_char.group_by(&:to_s).values.map { \|x\| x.length / s.length.to_f }.reduce(0) { \|e, x\| e - x*Math.log2(x) }~~ ~~end</syntaxhighlight>~~ =={{header\|Run BASIC}}==

Entropy: Difference between revisions

Entropy (view source)