Follow us on:         # Entropy information theory matlab

entropy information theory matlab The results of the commands are the plots and figures presented within the text. 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. All these quantities are closely related and share a number of simple properties. In colloquial terms, if the particles inside a system have many Entropy, an international, peer-reviewed Open Access journal. The thermal entropy in thermodynamics is a physical quantity that indicates the degree of disorder of the molecular state. Matlab fractal viewers published by University of Stuttgart Download mandelbrot_gui. ” (Ina Fourie, Online Information Review, Vol. I had got values of conditional Entropy to be greater than 1, which was expected. This is a short video showing how to calculate the entropy of a grayscale image. The amount of randomness in X (in bits) 2. " Using PCA (principal component analysis), by preserving 40 principal components I compressed original image with 1218 KB to 301 KB using a Matlab function which I wrote. … it will contribute to further synergy between the two fields and the deepening of research efforts. Work fast with our official CLI. Featured on Meta Stack Overflow for Teams is now free for up to 50 users, forever Information theory is used in biology as an approach to analyzing and discovering enzyme binding sites in DNA. Our software comprises of MATLAB and Python 2. . The aim of this paper is to 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. 4k 3 3 gold badges 51 51 silver badges 103 103 bronze badges. IrawenElectronics,MATLAB Videos. If we know the generating equations for S then we analyze it analytically to determine the entropy. See full list on dictionary. They used the structural entropy of graphs to study the dynamic evolution of networks, information interaction between nodes, and natural clustering of nodes and made some new progress [13,14,15]. Thus, we are more interested in the average information that a source produces than the information content of a single symbol. If the distribution in the histogram is uniform across all bins, then it is difﬁcult to predict the value of a voxel. , in our approach, we look at the alignment prob-lem from a stochastic viewpoint and employ rigorous results from the information, probability and graph theory literatures to design practical and useful algorithms. The rst building block was entropy, which he sought as a functional H() of probability densities with two desired properties: 1. In this paper we compare different approaches to evaluate transfer entropy, some of them already proposed, some novel, and present their implementation in a freeware MATLAB toolbox. The concept is based on the Shannon entropy, or information entropy, in information theory. It provides implementations of Shannon's Information Theory functions and implementations of Renyi's Entropy and Alpha Divergence. A source S={a,b,c} is a source with three alphabetic symbols of no particular numeric value. If we consider an event, there are three conditions of occurrence. Share. Dirichlet computes the Bayesian estimates of the bin frequencies using the Dirichlet-multinomial pseudocount model. * And ignorance: Generally, one views entropy as a measure of our ignorance of the microscopic state of a system; This seems to make entropy a subjective thing which, for a given system, depends on how much we wanted to find out, and could be decreased if we just measured something more; This is so, but in practice it is not a real problem E = wentropy (X,T) returns the entropy specified by T of the vector or matrix X. Ran G. p is an optional parameter depending on the value of etype. Improve this question. Estimation of Entropy and Mutual Information Liam Paninski [email protected] In other words, a difference in The following Matlab project contains the source code and Matlab examples used for information theory toolbox. Nowadays there are heaps of articles on the theory of fuzzy entropy and fuzzy mutual information. This statement was made quantitative by Shannon. We’ll discuss the differences when using cross-entropy in each case scenario. Aging is a multifactorial physiological process characterized by the accumulation of degenerative processes impacting on different brain functions, in… . 694 = . Entropy is just a way of expressing the number of states of a system. The mutual information is a quantity that measures the mutual dependence of the two random variables. sensagent. Barbé et. It is de ned in terms of entropy and conditional entropy. Dirichlet estimates the Shannon entropy H of the random variable Y from the cor- str = unique_strings (index); % Calculate the information, % given probability of the current str. Entropy is a common concept in many fields, mainly in signal processing. Yao Xie, ECE587, Information Theory, Duke University Specific topics that will be covered include representation of information by spiking neurons, processing of information in neural networks, and algorithms for adaptation and learning. E = wentropy (X,T) returns the entropy specified by T of the vector or matrix X. So it is legitimate to say entropy NH is "information". Learn more about entropy MATLAB. The spectral entropy (SE) of a signal is a measure of its spectral power distribution. Share. al. That's like calling a function that returns a speed a "meter". However, estimating entropy from observations is surprisingly difficult, and is still an active area of research. Information & Entropy •Information Equation p = probability of the event happening b = base (base 2 is mostly used in information theory) *unit of information is determined by base base 2 = bits base 3 = trits base 10 = Hartleys base e = nats Entropy can be defined for dynamical systems with continuous time because For special flows the so-called Abramov formula connects the entropy of the flow with the entropy of the base automorphism. By using entropy, a measure of uncertainty, to analyze samples, informa-tion can be gained to make predictions more certain, or less uncertain. Inspired by structural information theory, in this work, we studied the structural properties of formulas by using the structural entropy of graphs. % Sum the information to get an entropy value. Entropy has a very simple definition,, where is the probability of i-th symbol. Dirichlet Dirichlet Prior Bayesian Estimators of Entropy, Mutual Information and Other Related Quantities Description freqs. This paper provides a new way of understanding and estimating the MI using the copula function. For example: A dataset of only blues would have very low (in fact, zero) entropy. His discussion of probability and entropy is excellent and he does a nice job motivating the de nition of the Shannon entropy. † Video A standard frame rate for video is about 30 frames/sec. To do so, the transmitter sends a series (possibly just one) partial messages that give clues towards the original message. 246 I need . A binary symmetric channel (or BSC) is a common communications channel model used in coding theory and information theory. In this context, the term usually refers to the Shannon entropy, which quantifies the expected value of the information % contained in a message, usually in units such as bits. Follow edited Oct 23 '12 at 2:36. We’ll consider X to be a discrete random variable. Therefore, estimates of the MI are fundamentally important in most information theory applications. Information entropy is the aggregate rate at which information is created by a stochastic wellspring of information. Run julia_gui in Matlab. The entropy quantifies the expected value of the information contained in a vector. 36 (3), 2012) TRENTOOL is an implementation of transfer entropy and mutual information analysis that aims to support the user in the application of this information theoretic measure. edu Center for Neural Science, New York University, New York, NY 10003, U. If nothing happens, download GitHub Desktop and try again. Matlab/Octave; Entropy of entanglement: $$entE(\rho,dim)$$ Entropy of entanglement of a bipartite density matrix $$\rho$$ with subsystem dimensions given by the vector $$dim$$. Learn more . 93 and of the compressed file was 7. In this context, a Lecture 2: Entropy and Mutual Information Entropy Mutual Information Dr. entropy H(X) indicates how much information the dataset contains. Cross-entropy builds upon the idea of information theory entropy and measures the difference between two probability distributions for a given random variable/set of events. Examples are entropy, mutual information, conditional entropy, conditional information, and relative entropy (discrimination, Kullback-Leibler Entropy (Information Theory) In information theory, the major goal is for one person (a transmitter) to convey some message (over a channel) to another person (the receiver). You can use MATLAB's built-in entropy function, but this assumes that there are 256 unique levels. Dear Colleagues, Introduced 16 years ago in a seminal paper by C. We will make use of Matlab/Octave/Python demonstrations and exercises to gain a deeper understanding of concepts and methods introduced in the course. The measure of information entropy associated with each possible data value is the negative logarithm of the probability mass function for the value: In information theory, entropy is a measure of the uncertainty in a random variable. In TG Dietterich, S Becker, and Z Ghahramani, editors, Advances in Neural Information Processing Systems 14, Cambridge, MA, 2002. TRENTOOL is implemented as a MATLAB toolbox and available under an open source license (GPL v3). Lecture 8: Information Theory and Maximum Entropy Lecturer: Mike Morais Scribes: 8. Qualitatively, entropy is a measure of uncertainty – the higher the entropy, the more uncertain one is about a random variable. please let me know some resources where can i get information about this. Shannon uses the concept of information entropy to describe the uncertainty of the source. zip. Entropy also represents the smallest average length to encode a message. Among the tools of information theory we find entropy and mutual information. The exposition of entropy theory of dynamical systems can be found in many monographs and textbooks, see e. mon to ergodic theory and information theory and comprise several quantitative notions of the information in random variables, random processes, and dynam-ical systems. A. This is what motivated me to write the Information Theoretical Estimators toolbox – as a leisure activity. A. S. He postulated that a measure of uncertainty of a random variable $$X$$ should be a continuous function of its probability distribution $$P_{X}(x)$$ and should satisfy the following conditions: tobj = wpdec (x,n,wname,etype,p) uses the entropy type specified by etype. The solution depends on N + 1 Lagrange multipliers which are determined by solving the set of nonlinear equations formed by the N data constraints and the normalization constraint. See section 1. An efficient algorithm for selecting optimal configurations of AR-coefficients, Twentieth Symp. In probability theory and information theory, the mutual information (MI) of two random variables is a measure of the mutual dependence between the two varia 2 Entropy For information theory, the fundamental value we are interested in for a random variable X is the entropy of X. In this context, the term usually refers to the Shannon entropy, which quantifies the expected value of the message's information. Otherwise the best we can do is estimate the entropy from a stream of the generated symbols. ENTROPY (X,P) returns the (joint) entropy for the joint distribution corresponding to object matrix X and probability vector P. Applications to simulated and real data are presented. Shannon entropy (information theory). So we need to generalize the formula H (x) = log (# states). In this perspective a significant example is that of entropy in Information Theory. information-theory entropy. 1 Fundamentals of Information theory Information theory started with Claude Shannon’s A mathematical theory of communication. entropy matlab information-theory mutual-information capacity rate-distortion. VOICEBOX: Speech Processing Toolbox for MATLAB Introduction. , Werkgemeenschap Informatie- en Communicatietheorie, Enschede (NL), and IEEE Benelux Chapter on Information Theory, ISBN: 90-71048-14-4, abstract for entropy H = entropy(S) this command will evaluate the entropy of S, S should be row matrix H = entropy([X;Y;Z]) this command will find the joint entropy for the 3 variables H = entropy([X,Y],[Z,W]) this will find H(X,Y/Z,W). See more ideas about information theory, theories, entropy. This is a short video showing how to calculate the entropy of a grayscale image. In information theory, entropy is a measure of the uncertainty associated with a random variable. We present some new results on the nonparametric estimation of entropy and mutual information. 5 Probability p Matlab Function plotrelentropy. Each row of MxN matrix X is an N-dimensional object, and P is a length-M vector containing the corresponding probabilities. m) Entropy Encoding in Wavelet Image Compression 3 But in mathematics, or more precisely in operator theory, the under-lying idea dates back to work of John von Neumann, Norbert Wiener, and Herman Wold, where nested and closed subspaces in Hilbert space were used extensively in an axiomatic approach to stationary processes, especially for time series. All functions expect discrete inputs. TRENTOOL is implemented as a MATLAB toolbox and available under an open source license (GPL v3). Now about the entropy. Bandt and B. That's very simple to explain. Namely, it is the (log of the) number of microstates or microscopic configurations. Actually the entropy of the compressed version must be lesser, right? information-theory entropy. entropy. Rényi p-entropy of density matrix $$\rho$$. In the context of training Decision Trees, Entropy can be roughly thought of as how much variance the data has. The entropy of the copula density function (termed as the copula entropy or copula information) is defined as a measure of the dependence uncertainty represented by the copula function. ⓘ Entropy (information theory) Information entropy is the average rate at which information is produced by a stochastic source of data. Please validate this function before using it The classical maximum entropy (ME) problem consists of determining a probability distribution function (pdf) from a finite set of expectations μ n = E { ø n ( x )} of known functions ø; n (x), n = 0, …, N. And here's the answer, the answer, this is the full definition of entropy, the most general definition, is minus the sum over the probability of each state, so x equaling xi times the log of that probability where the sum is over all of the states, i. Shannon calculated that the measure of information entropy associated with each possible data value is the negative logarithm of the probability mass function for the value: Entropy measures the expected amount of information conveyed by identifying the outcome of a random event, where the possible outcomes are a probability function. The proportion of information entropy related to every potential information value is the negative logarithm of the likelihood mass function for the worth. If you have a background in thermodynamic studies, it can make it easier to understand the concept of entropy. The concept is based on the Shannon entropy, or information entropy, in information theory. Entropy (Play Tennis) - Entropy (Play Tennis | Outlook) = . The goal in ITE is to (i) cover the state-of-the-art nonparametric information theoretical estimators, (ii) in a An efficient algorithm for selecting optimal configurations of AR-coefficients, Twentieth Symp. These tools form an area common to ergodic theory and information theory and comprise several quantitative notions of the information in random variables, random processes, and dynamical systems. Entropy measures the uncertainty associated with a random variable, i. Transfer entropy is rooted in information theory and based on the concept of Shannon entropy as a measure of uncertainty. We also say that H(X) is approximately equal to how much information we learn on average from one instance of the random variable X. Browse other questions tagged matlab entropy or ask your own question. I ask this because, I computed conditional entropy myself with the aid of MutualInformation function and MATLAB's entropy() method. ) 4. p is an optional parameter depending on the value of etype. Updated on Jun 28, 2020. , Werkgemeenschap Informatie- en Communicatietheorie, Enschede (NL), and IEEE Benelux Chapter on Information Theory, ISBN: 90-71048-14-4, abstract information from the occurrence of the event: I(1) = 0. Download julia_gui. on Information Theory in the Benelux, May 27-28, 1999, Haasrode (B), pp 189-196, eds. g. Transfer entropy has emerged as a powerful tool to quantify directed dynamical interactions. Entropy, so far, had been a concept in physics. Learning the entropy information theory in calculus is a good way to understand how probability works and how many of the data systems you encounter produce various amounts of information. Entropy and Information Theory is highly recommended as essential reading to academics and researchers in the field, especially to engineers interested in the mathematical aspects and mathematicians interested in the engineering applications. Information theory is a mathematical approach to the study of coding of information along with the quantification, storage, and communication of information. 246 bits less to send my message if I know the Outlook. Shannon introduced the formula for entropy in his 1948 paper "A Mathematical Theory of Communication. Chapter 8: Differential entropy, 1 lecture Chapter 12: Maximum entropy, 1 lecture Chapter 9: Gaussian channel capacity, 2 lectures Chapter 10: Rate-distortion theory, 2 lectures Chapter 11: Information theory and statistics, 4 lectures Chapter 13: Universal source coding, 2 lectures Conclusions: TRENTOOL is an implementation of transfer entropy and mutual information analysis that aims to support the user in the application of this information theoretic measure. Mutual information is a special case of a more general quantity called relative entropy, which is a measure of the distance between two probability distributions. However, I am getting all conditional entropy values < 1 using InfoTheory toolbox's conditonalEntropy() function. It is sometimes called the missing information: the larger the entropy, the less a priori information one has on the value of the random variable. The following example lists different entropy criteria. The SE treats the signal's normalized power distribution in the frequency domain as a probability distribution, and calculates the Shannon entropy of it. end. View. $\endgroup$ – ignatius Oct 27 '16 at 14:59 Information Entropy. As such, a machine learning practitioner requires a strong understanding and intuition for information and entropy. In this model, A binary symmetric channel (or BSC) is a common communications channel model used in coding theory and information theory. (PDF, 141973 bytes) More details about the algorithm can be found in this collection of theory papers. arXiv: physics/0108025. 5 MB, more than the 1000 page text document. zip. Deﬁnition The entropy of a discrete random variable X with pmf pX(x) is H(X) = − X x p(x)logp(x) = −E[ log(p(x)) ] (1) The entropy measures the expected uncertainty in X. We will want our information measure Mutual Information - Measure of the amount of information that one random variable contains about another random variable. You are probably thinking of the wentropy function, which does permit 'shannon' as a second parameter. VOICEBOX is a speech processing toolbox consists of MATLAB routines that are maintained by and mostly written by Mike Brookes, Department of Electrical & Electronic Engineering, Imperial College, Exhibition Road, London SW7 2BT, UK. Unpack into "matlab" directory on K: drive. Follow asked Feb 25 '17 at 16:35. Application of Information Theory, Lecture 2 Joint & Conditional Entropy, Mutual Information Handout Mode Iftach Haitner Tel Aviv University. My aim is to calculate Shannon Information Entropy (see Shannon Information Entropy for formula) for a string corresponding to each participant, and then output the values into a csv file where column A would correspond to participant id and column B to Shannon entropy value for each participant. A system with many states has a high entropy, and a system with few states has a low entropy. Relationship between Entropy and Mutual Information Chain Rules for Entropy, Relative Entropy and Mutual information 2 Inequalities in Information Theory Jensen inequality and its consequences Log sum inequality and its applications Data-processing inequality Su¢ cient statistics Fano™s inequality Radu Trîmbi‚ta‚s (UBB) Entropy Oct 28, 2017 - Explore David Cho's board "Information Theory", followed by 104 people on Pinterest. 19. Over the years, through seminal work, we have learnt that statistical mechanics and thermodynamics are special consequences of entropy maximization. But it is MATLAB!! Spectral Entropy is defined for the PSD of a signal, which is an orthonormal transformation of the signal and the documentation says that the entropy is calculated over the components of the signal in an orthonormal basis Anyway, I'm quite confused . 7(3) packages that can estimate the Shannon entropy of a discrete distribution from independent identically distributed samples from this distribution, and the mutual information between two discrete random variables from samples. See wentropy for more information. Cite. Claude E. Parallel to recent trends in computer vision, e. 181 3 3 bronze badges $\endgroup$ Add a comment | Shannon’s entropy is the fundamental building block of information theory – a theory of communication, compression, and randomness. Since, the cost of encoding something can be thought of as the number of bits we need to send through a channel, and the optimum value (entropy) can be achieved, then entropy becomes the expected cost of encoding a distribution of messages. Mutual information is the information that one random variable contains about another random variable. Run mandelbrot_gui in Matlab. MATLAB. The importance of both entropy and mutual information can be seen through their appearance in several important theorems of information theory, although their applications extend to In information theoretic terms, the information entropy of a system is the amount of "missing" information needed to determine a microstate, given the macrostate. Cite. MIT Press. Shannon entropy is one of the most important metrics in information theory. , AVERAGE INFORMATION) (i) Definition In a practical communication system, we usually transmit long sequences of symbols from an information source. but, what is the physical meaning of the entropy value. what physically this values resembles the probability distribution. Information Gain is the number of bits saved, on average, if we transmit Y and both receiver and sender know X Information is the source of a communication system, whether it is analog or digital. tobj = wpdec (x,n,wname,etype,p) uses the entropy type specified by etype. 940 - . Thus, the probability of object X (i,:) is P (i). Conditions of Occurrence of Events. g. Before we get to Information Gain, we have to first talk about Information Entropy. Cross entropy can be applied in both binary and multi-class classification problems. Entropy measures the uncertainty of a random value. Find the treasures in MATLAB Central and discover how the community can help you! Matlab code to compute entropy, conditional entropy, mutual information, channel capacity, and rate distortion. A. See wentropy for more information. 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. The entropy can be thought of as any of the following intuitive de nitions: 1. the expected value of the information in the message (in classical informatics it is measured in bits). Barbé et. For both, set Resolution=2000 and Number of iterates=100 in the GUI control panel. Nov 4, 2014 Iftach Haitner (TAU) Application of Information Theory, Lecture 2 Nov 4, 2014 1 / 26 Information Theory Measure of Information: Entropy Binary Relative Entropy q=0. This measure is roughly speaking the logarithm of the number of typical values that entropy. This toolbox contains functions for discrete random variables to compute following quantities: 1)Entropy 2)Joint entropy 3)Conditional entropy 4)Relative entropy (KL divergence) 5)Mutual information 6)Normalized mutual information 7)Normalized variation information This toolbox is a Entropy and inference, revisited. The word information entropy is Claude Elwood Shannon borrowed from thermodynamics [ 17]. In 1928, Hartley  introduced a measure for information calculated as the logarithm of the number of all possible symbol sequences that can occur based on a specific probability distribution (see the example in  ). 3. discusses statistical mechanics from an information theory point of view. Online MatLab and Python computer programs provide hands-on experience of information theory in action, and PowerPoint slides give support for teaching. It is important to note that information theory allows researchers to move beyond simply quoting p-values because information theory analyses produce results in bits, which allows for a direct measurement of effect size (though bias effects must be considered as well; see Bias in Entropy and Mutual Information). MIToobox for C and MATLAB This toolbox is aimed at people working on discrete datasets for classification. It can differ significantly depending on your use case and data format. Pompe, the concept of permutation entropy (PE) has attracted much attention from researchers from a plethora of fields. . topics include a summary of the relationship between information theory and thermodynamic entropy, and a review of applications in telecommunications and biology. al. what type of values it can have (-inf to +inf). INFORMATION, ENTROPY, AND CODING 6 characters per word, this means such an image is worth more 100,000 words, rather than 1,000 words! Only 7 such images would result in about 5. information theory, how to estimate entropy. 17. In the first example (the one that uses the entropy function), Matlab is forced to treat X as a grayscale image (a matrix whose values are either between 0 and 1 or ranging from 0 to 255). Entropy then becomes the self‐information of a random variable. MATLAB PROGRAM for Entropy and Mutual Information for Binary Symmetric Channel. Three different methods for using the entropy in image processing are introduced, entropy filtration, entropy segmentation, and point information gain. Although entropy originated from statistical mechanics, within physics, it is more generally applicable and better understood from the perspective of information theory. Using If matlab code available for computing this, kindly help me with the link. Information is gained by Entropy has many interpretations such as "measurement of order" or "measurement of information", but instead of looking at the interpretations you could just look at what it actually is. The SE treats the signal's normalized power distribution in the frequency domain as a probability distribution, and calculates the Shannon entropy of it. i tried from various sources but i am not very clear about that. E = wentropy (X,T) returns the entropy specified by T of the vector or matrix X. you can use it for any combination of joint entropies . what is properties of entropy in information theory ? ENTROPY (I. It is the reduction in the uncertainty of one random variable because of the knowledge of the other; TASK: Obtain the proofs of the equations in the attached figure if you are new to information theory Entropy is quite possibly the “fundamental unit” of information theory, and it’ll continue coming up in all kinds of interesting ways. The entropy of the original file was 6. First, we use an exact local expansion of the Intuitively, the entropy gives a measure of the uncertainty of the random variable. The description is completed by mathematical equations as well as by commented MATLAB commands. Intuitively, entropy reaches its maximum log n when all alphabets occur with same probability, and likewise has a minimum of 0 if p k = 1 for some k. First, the entropy of the copula, named the copula entropy, is defined as a measure of the dependence uncertainty represented by the copula function E = wentropy (X,T) returns the entropy specified by T of the vector or matrix X. We can think of H ( X ) H(X) H ( X ) as quantifying how much we’ll be “surprised” by the outcome of X X X on average. If two independent events occur (whose joint probability is the product of their individual probabilities), then the information we get from observing the events is the sum of the two informations: I(p1 p2) = I(p1)+I(p2): (This is the critical property . com This course explores the ultimate limits to communication and computation, with an emphasis on the physical nature of information and information processing. ITE is a recently released, free and open source, multi-platform, Matlab/Octave toolbox released under GPLv3(>=) license. The entropy of entanglement is defined as the von-Neumann entropy of the reduced density matrix of either subsystem. The following Matlab project contains the source code and Matlab examples used for information theory toolbox. el-flor el-flor. theory of communication, but much of the space is devoted to the tools and methods required to prove the Shannon coding theorems. Entropy and Information Theory is highly recommended as essential reading to academics and researchers in the field, especially to engineers interested in the mathematical aspects and mathematicians interested in the engineering applications. , [B], [CFS], [P], [W]. This toolbox contains functions for discrete random variables to compute following quantities: 1)Entropy 2)Joint entropy 3)Conditional entropy 4)Relative entropy (KL divergence) 5)Mutual information 6)Normalized mutual information 7)Normalized variation information This toolbox is a To finally compute Mutual Information, you're going to need the entropy of the two images. Topics include: information and computation, digital signals, codes and compression, applications such as biological representations of information, logic circuits, computer architectures, and algorithmic information, noise, probability The entropy function only permits a single parameter. nyu. Use Git or checkout with SVN using the web URL. … it will contribute to further synergy between the two fields and the deepening of research efforts i am very thankful for your valuable help. Unpack into "matlab" directory on K: drive. In short, the entropy of a random variable is an average measure of the difficulty in knowing the state of that variable. GitHub - maximumGain/information-theory-tool: Matlab code to compute entropy, conditional entropy, mutual information, channel capacity, and rate distortion. Based on numerous requests from students and researchers, I have prepared this code to simplify such concepts and give a tool that you can try directly. However, there is a clear significant lack for a Matlab implementation of these concepts. 2 Comments Classical entropy-based criteria match these conditions and describe information-related properties for an accurate representation of a given signal. . In fact, in the view of Jaynes (1957), thermodynamic entropy, as explained by statistical mechanics, should be seen as an application of Shannon's information theory: the thermodynamic entropy is interpreted as being proportional to the amount of further Shannon information needed to define the detailed microscopic state of the system, that ary of image processing, computer vision and information theory. 7 of his classic A Mathematical Theory of Communication and search on "per symbol" and "units" to see he always stated his entropy H has units of "bits/symbol" or "entropy/symbol" or "information/symbol". Note that the code above is just a brief example to show how you might structure your code. e. Description Computes Shannon entropy and the mutual information of two variables. e. on Information Theory in the Benelux, May 27-28, 1999, Haasrode (B), pp 189-196, eds. entropy information theory matlab 