wehub-resource-sync
12 lines
294 B
Matlab
Executable File
12 lines
294 B
Matlab
Executable File
function z = entropy(x)
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% Compute entropy z=H(x) of a discrete variable x.
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% Input:
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% x: a integer vectors
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% Output:
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% z: entropy z=H(x)
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% Written by Mo Chen (sth4nth@gmail.com).
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n = numel(x);
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[~,~,x] = unique(x);
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Px = accumarray(x, 1)/n;
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Hx = -dot(Px,log2(Px));
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z = max(0,Hx); |