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Just another update

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This commit is contained in:
Ingy döt Net 2015-02-20 00:35:01 -05:00
parent a25938f123
commit 00a190b0a6
6591 changed files with 94363 additions and 23227 deletions
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5
Task/Entropy/D/entropy.d
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@ -1,11 +1,12 @@
import std.stdio, std.algorithm, std.math;
double entropy(T)(T[] s)
/*pure nothrow*/ if (__traits(compiles, s.sort())) {
pure nothrow if (__traits(compiles, s.sort())) {
immutable sLen = s.length;
return s
.sort()
.group
.map!(g => g[1] / double(s.length))
.map!(g => g[1] / double(sLen))
.map!(p => -p * p.log2)
.sum;
}