清空筛选条件
清空筛选条件

entropy of a signal

141 次查看（过去 30 天）
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.

请先登录，再进行评论。

请先登录，再回答此问题。

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

类别

在 Help Center 和 File Exchange 中查找有关 Get Started with Signal Processing Toolbox 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by