# Mutual And Self Information Entropy Pdf

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## A Gentle Introduction to Information Entropy

Updated 07 Mar Mo Chen Retrieved February 28, Comming the same problem which Maksim : who knows why nmi randi ,1,1e3 ,randi ,1,1e3. They're different series of numbers, so how they share similar information?

Can any one tell me maximum possible value must achieve according to simulation based for these tests. In the conditional entropy, you cannot calculate the joint distribution from marginal distributions.

The joint distribution should be one of the arguments of the function. I don't think either of the proposed solutions provided by Francesco and Subash are correct. If you have. The original code does, whereas Francesco's change doesn't. So simply reversing the order is incorrect. The underlying error is that the code expects x and y to be positive integers. Rounding a continuous variable will mean that you have valid indexes except if the input has a value that rounds to zero.

However, you could consider this as being analogous to binning the data, except that if multiple points go into the same bin, that bin will only ever have a value of 1. So I suspect Subash's suggestion also invalidates the calculation. The real answer is actually provided by the author in the package description: "This toolbox contains functions for discrete random variables". A different approach must be used if one or both of the variables is continuous. Hey guys, regarding sparse function error, which answer is correct of the below as answered by francesco and subash Is the output of the conditionalEntropy function a normalized value?

I had got values of conditional Entropy to be greater than 1, which was expected. Very useful and efficient toolbox, thank you. However, there is a bug in the nmi. But this is obvious a typo, so it does not influence my rating. Learn About Live Editor.

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Information Theory Toolbox version 1. Functions for Information theory, such as entropy, mutual information, KL divergence, etc. Follow Download. Overview Functions. Cite As Mo Chen Comments and Ratings Rey9 14 Jan Shuai Feng 3 Dec Fawad Masood 27 Dec Mohamed EL-Raghy 24 May I think the problem is here sparse idx,x,1,n,k,n. Karel Mundnich 5 Nov Romesh 18 Sep Arvind 2 Sep Francesco Onorati 10 Dec Anuja Kelkar 4 Dec Has the output been normalized?

Please let me know. Partha 7 Oct I got different result using entropy sig and wentropy sig,'shannon'. Can any one explain this? Subash Padmanaban 18 Jul Nejc Ilc 10 Dec Maksim 27 Nov Take back my last comment. Zulkifli Hidayat 17 Sep Jeff 11 May Is there anyway how can we make these measure on time cries data? Tags Add Tags conditional entropy entropy information theory joint entropy kl divergence mutual information normalized mutual Start Hunting!

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## Mutual information

Information is the source of a communication system, whether it is analog or digital. Information theory is a mathematical approach to the study of coding of information along with the quantification, storage, and communication of information. These three events occur at different times. The difference in these conditions help us gain knowledge on the probabilities of the occurrence of events. When we observe the possibilities of the occurrence of an event, how surprising or uncertain it would be, it means that we are trying to have an idea on the average content of the information from the source of the event.

Information theory is a subfield of mathematics concerned with transmitting data across a noisy channel. A cornerstone of information theory is the idea of quantifying how much information there is in a message. More generally, this can be used to quantify the information in an event and a random variable, called entropy, and is calculated using probability. Calculating information and entropy is a useful tool in machine learning and is used as the basis for techniques such as feature selection, building decision trees, and, more generally, fitting classification models. As such, a machine learning practitioner requires a strong understanding and intuition for information and entropy.

## Digital Communication - Information Theory

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Imagine that someone hands you a sealed envelope, containing, say, a telegram.

Updated 07 Mar Mo Chen Retrieved February 28, Comming the same problem which Maksim : who knows why nmi randi ,1,1e3 ,randi ,1,1e3. They're different series of numbers, so how they share similar information?

In probability theory and information theory , the mutual information MI of two random variables is a measure of the mutual dependence between the two variables. More specifically, it quantifies the "amount of information" in units such as shannons , commonly called bits obtained about one random variable through observing the other random variable. The concept of mutual information is intimately linked to that of entropy of a random variable, a fundamental notion in information theory that quantifies the expected " amount of information " held in a random variable. MI is the expected value of the pointwise mutual information PMI. The quantity was defined and analyzed by Claude Shannon in his landmark paper A Mathematical Theory of Communication , although he did not call it "mutual information".

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