entropy of a signal

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siddhartha chandel
siddhartha chandel 2012-6-27
回答： dany katamba mpoyi 2022-5-4
Hello every body . Please give me command for entropy calculation of a signal. How we can calculate using wentropy function in wavelet? Thanks in advance .
  2 个评论
divya pawar
divya pawar 2020-2-23
The entropy function given in Matlab is for image processing, so for other signals simply the formula
entropy= -sum(p*log2(p));
If probabilities are not known , you can use histogram to find them
h1=histogram(your_signal, 'Normalization', 'Probability');
h1.Values;
mamta p
mamta p 2020-5-21
编辑：mamta p 2020-5-21
thank you Divya Pawar mam.

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回答（2 个）

maria
maria 2012-9-25
Hi! For find the value of entropy for a signal 1-dimensional, can use:
p = hist(signal length);
entropy = -sum(p.*log2(p));
Do this solve your question?
dany katamba mpoyi
I = randn(10000000,1);
p = hist(I,1000000);
% remove zero entries in p
p(p==0) = [];
% normalize p so that sum(p) is one.
p = p ./ numel(I);
Eg = -sum(p.*log(p));
I = randn(10000000,1);
p = hist(I,1000000);
% remove zero entries in p
p(p==0) = [];
% normalize p so that sum(p) is one.
p = p ./ numel(I);
Et = -sum(p.*log(p));
negE=Et-Eg

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