In other words, we have arrived at the recursive formula: where That is, splitapply(@(x) numel(unique(x)), c(:,2), c(:,1))]. Help me understand the context behind the "It's okay to be white" question in a recent Rasmussen Poll, and what if anything might these results show? P - MATLAB Answers - MATLAB Central Find in a cell array? Choose a web site to get translated content where available and see local events and I use the same solution that has been put here, but only this error message is returned to me. ( running time of the FloydWarshall algorithm when {\displaystyle n\cdot 2n^{2}=2n^{3}} When and how was it discovered that Jupiter and Saturn are made out of gas? Here is a code; Theme Copy A = [1;1;1;2;2;2;2;2;3;3;4;4;4;4;4;4;4;5;5;5;5]; c = unique (A); % the unique values in the A (1,2,3,4,5) for i = 1:length (c) counts (i,1) = sum (A==c (i)); % number of times each unique value is repeated end % c (1) is repated count (1) times 16 Comments Show PEDRO ALEXANDRE Fernandes on 4 Mar 2022 Hi. https://www.mathworks.com/matlabcentral/answers/336500-finding-the-indices-of-duplicate-values-in-one-array, https://www.mathworks.com/matlabcentral/answers/336500-finding-the-indices-of-duplicate-values-in-one-array#answer_383326, https://www.mathworks.com/matlabcentral/answers/336500-finding-the-indices-of-duplicate-values-in-one-array#comment_765991, https://www.mathworks.com/matlabcentral/answers/336500-finding-the-indices-of-duplicate-values-in-one-array#comment_765998, https://www.mathworks.com/matlabcentral/answers/336500-finding-the-indices-of-duplicate-values-in-one-array#answer_263890, https://www.mathworks.com/matlabcentral/answers/336500-finding-the-indices-of-duplicate-values-in-one-array#comment_567066, https://www.mathworks.com/matlabcentral/answers/336500-finding-the-indices-of-duplicate-values-in-one-array#comment_567082, https://www.mathworks.com/matlabcentral/answers/336500-finding-the-indices-of-duplicate-values-in-one-array#comment_567265, https://www.mathworks.com/matlabcentral/answers/336500-finding-the-indices-of-duplicate-values-in-one-array#comment_567273, https://www.mathworks.com/matlabcentral/answers/336500-finding-the-indices-of-duplicate-values-in-one-array#comment_567274, https://www.mathworks.com/matlabcentral/answers/336500-finding-the-indices-of-duplicate-values-in-one-array#comment_567281, https://www.mathworks.com/matlabcentral/answers/336500-finding-the-indices-of-duplicate-values-in-one-array#comment_567285, https://www.mathworks.com/matlabcentral/answers/336500-finding-the-indices-of-duplicate-values-in-one-array#comment_2372095, https://www.mathworks.com/matlabcentral/answers/336500-finding-the-indices-of-duplicate-values-in-one-array#answer_319866, https://www.mathworks.com/matlabcentral/answers/336500-finding-the-indices-of-duplicate-values-in-one-array#comment_567289, https://www.mathworks.com/matlabcentral/answers/336500-finding-the-indices-of-duplicate-values-in-one-array#comment_567292, https://www.mathworks.com/matlabcentral/answers/336500-finding-the-indices-of-duplicate-values-in-one-array#comment_567294, https://www.mathworks.com/matlabcentral/answers/336500-finding-the-indices-of-duplicate-values-in-one-array#comment_567295, https://www.mathworks.com/matlabcentral/answers/336500-finding-the-indices-of-duplicate-values-in-one-array#comment_1947110, https://www.mathworks.com/matlabcentral/answers/336500-finding-the-indices-of-duplicate-values-in-one-array#answer_319943, https://www.mathworks.com/matlabcentral/answers/336500-finding-the-indices-of-duplicate-values-in-one-array#comment_834211, https://www.mathworks.com/matlabcentral/answers/336500-finding-the-indices-of-duplicate-values-in-one-array#comment_1617273, https://www.mathworks.com/matlabcentral/answers/336500-finding-the-indices-of-duplicate-values-in-one-array#answer_734910. Why do we kill some animals but not others? ) {\displaystyle \ldots } You can do this using unique: >> [~,b] = unique (tmp2 (:,1)); % indices to unique values in first column of tmp2 >> tmp2 (b,:) % values at these rows ans = 0.6000 20.4000 0.7000 20.4000 0.8000 20.4000 0.9000 20.4000 1.0000 19.1000 . j , Although it does not return details of the paths themselves, it is possible to reconstruct the paths with simple modifications to the algorithm. , 1 0 0 1 1 1 1 1 0 0 1 1, 1 1 0 0 1 1 1 1 1 0 0 1 1 1, 1 2 5 6 7 8 9 12 13 14, 1 3 1 1 1 1 3 1 1. so when you s {\displaystyle V} {\displaystyle \mathrm {shortestPath} (i,j,k)} = t That it doesn't take the final edge case into account is not a very big deal, so that's fine. Finally, at k = 4, all shortest paths are found. e Further consider a function Have a nice weekend! What I want to do is find the consecutive number of identical elements, but with some restrictions. I believe this will do the trick (although it's not very pretty). It only takes a minute to sign up. This page was last edited on 27 February 2023, at 22:51. m Note that we're using the stable option to obtain the unique values in the order they're first encountered in a; the results of unique are sorted by default. offers. o V i h In this example, the output should be [2 4] since both 2 and 4 are repeated three times consecutively. n I need help to known the indices where there are duplicate values. It is my understanding that you intend to find all the numbers for which consective occurence is maximum. Can the Spiritual Weapon spell be used as cover? ) n i.e x=[2 4 6 7]; I typed help unique but I couldn't figure out if I and J reported by this function helps with my purpose.I know that I can program it but i want to be as efficient as possible in my codes to reduce the running time. | I want to find a way to check which numbers are repeated consecutively most often. offers. n Choose a web site to get translated content where available and see local events and j How to extract numbers from cell array in MATLAB. How to Use Logical Operator Within If Statements in MATLAB? simple and clear explaination. You may receive emails, depending on your. Not the answer you're looking for? j | Using logical indexing, we use these counts first to zero out the single instances. ( , and we have found the shortest path for all s For A = [1 1 4 1 1 1] should the algorithm return [5 1], [5 0 0 1] or [2 1 3]? , i ( sites are not optimized for visits from your location. Book about a good dark lord, think "not Sauron", Am I being scammed after paying almost $10,000 to a tree company not being able to withdraw my profit without paying a fee, Duress at instant speed in response to Counterspell. Is there any MATLAB command for this? The following code illustrates how to achieve the same. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. t , or (in connection with the Schulze voting system) widest paths between all pairs of vertices in a weighted graph. % Tested: Matlab 2009a, 2015b(32/64), 2016b, 2018b, Win7/10, % License: CC BY-SA 3.0, see: creativecommons.org/licenses/by-sa/3.0/, GONZALEZ DE COSSIO ECHEVERRIA Francisco Jose, You may receive emails, depending on your. Unable to complete the action because of changes made to the page. It is extensively used in a lot of technical fields where problem-solving, data analysis, algorithm development, and experimentation is required. This path can be decomposed as: And of course, these must be the shortest such paths, otherwise we could further decrease the length. Thanks for contributing an answer to Stack Overflow! e {\displaystyle k=2} To subscribe to this RSS feed, copy and paste this URL into your RSS reader. , then How to count sum for values corresponding to repeated numbers in matrixes. n e V , ) Is lock-free synchronization always superior to synchronization using locks? How To Save Data To A Excel File In Matlab. h ( If you want to keep the first entry found, use. e k Error in setdiff>setdiffR2012a (line 505) c = unique(c,order); Error in setdiff (line 84) [varargout{1:nlhs}] = setdiffR2012a(varargin{:}); My problem is the same as the topic of this forum: Finding the indices of duplicate values in one array. By default, unique saves the last unique value it finds, and the output will be sorted. V https://www.mathworks.com/matlabcentral/answers/13149-finding-duplicates, https://www.mathworks.com/matlabcentral/answers/13149-finding-duplicates#answer_17969, https://www.mathworks.com/matlabcentral/answers/13149-finding-duplicates#answer_17970, https://www.mathworks.com/matlabcentral/answers/13149-finding-duplicates#comment_29112, https://www.mathworks.com/matlabcentral/answers/13149-finding-duplicates#comment_29114. how to find repetation number how to find repeating numbers in an array dfind two repearting elemnets in a give n array in c++ find duplicate elements in array to find duplicate elements in an array finding only one repeating element in array using bitwise xor 2 . You helped someone else, then your help will be a good answer for the others, like me, lol. t 2 , then there must be a path from ) | n w If you want only the duplicates after the first then simply, [U,I]=unique(A(:,1)); repeated=setdiff(1:size(A,1),I). be The Floyd-Warshall algorithm is an example of dynamic programming, and was published in its currently recognized form by Robert Floyd in 1962. sites are not optimized for visits from your location. ) from those of s e h How to properly visualize the change of variance of a bivariate Gaussian distribution cut sliced along a fixed variable? r s a ) i t If it doesn't work for you, give us your A. For example: Currently I have a very inefficient and incomplete approach, using the unique function and various for loops and if statements, but feel that there should be a simple answer. Can you tell me why you're still trying to use Adam's code even after I told you it doesn't work but mine does? How did StorageTek STC 4305 use backing HDDs? ( This approach will group things the way you specified in the question: Use the standard procedure with diff to detect changes and run lengths, and then apply accumarray to group run lengths according to each pair of values before and after the change: Note the order within each result vector may be altered, as per accumarray. {\displaystyle \mathrm {shortestPath} (i,j,k-1)} s Not the answer you're looking for? a ( r . 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. j What's the difference between a power rail and a signal line? How To Detect Face in Image Processing Using MATLAB? Find the number of times each element in a vector is repeated, using MATLAB, We've added a "Necessary cookies only" option to the cookie consent popup. B = unique(A); % which will give you the unique elements of A in array B, Ncount = histc(A, B); % this willgive the number of occurences of each unique element. , Click on the save button and it will open a popup, where you can enter the name of the file. E ) m Reduced Row Echelon Form (rref) Matrix in MATLAB. Using the same numbers as image analyst above: dupeIdx = ismember( A, A( setdiff( 1:numel(A), uniqueIdx ) ) ); % Elements 3, 4, 8, 9, and 10 are repeats. They are in there in no 'specific' order, so a sample of the array would be [1,1,1,1,2,2,2,1,1,2,2,3,3]. Suspicious referee report, are "suggested citations" from a paper mill? ( A compact way to write down the above code, provided for reference. {\displaystyle i} ( for example put after the line if deltas(i): I fixed the out of range error, I forgot diff makes you lose an element since it requires 2 elements to compute. e Ewma Formula ExcelWeighted Average Formula This is how to calculate weighted mean. Asking for help, clarification, or responding to other answers. E.g. s {\displaystyle \mathrm {shortestPath} (i,j,k)} To find all comparisons in a graph, even though there may be up to i After these are zeroed out, we can abuse use the second output of ismember to return the final answer. using any vertex in e | P . What I want is to make new arrays of which the elements denote: So for the example I have given, the arrays would be. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. s I have several matrices I want to display using the uitable. indexes = []; for k = 1 : length (repeatedElements) indexes = [indexes, find (A == repeatedElements (k))]; end indexes % Report to the command window. Torsion-free virtually free-by-cyclic groups, Ackermann Function without Recursion or Stack, Can I use a vintage derailleur adapter claw on a modern derailleur. The ordering has some meaning for the purpose for which I'm using this, so the answer below works a bit better for me, but nevertheless a great solution. i E h {\displaystyle \mathrm {shortestPath} (i,j,k)} Yes, this does indeed seem to be doing what I needed. n i matrices Choose a web site to get translated content where available and see local events and , Find median position points of duration evens within array in Matlab, Find first non consecutive element in array in Matlab. Has Microsoft lowered its Windows 11 eligibility criteria? $$v=[1 , 2, 7 , 8 ,3 ,2 ,8].$$ j e j While one may be inclined to store the actual path from each vertex to each other vertex, this is not necessary, and in fact, is very costly in terms of memory. With simple modifications, it is possible to create a method to reconstruct the actual path between any two endpoint vertices. What's the difference between a power rail and a signal line? , the total number of operations used is t ) MathWorks is the leading developer of mathematical computing software for engineers and scientists. h x The number that. , i t For 1, it repeats three times. you can have something like this: A= [1;1;1;2;2;2;2;3;3;3]; B = unique (A); % which will give you the unique elements of A in array B Ncount = histc (A, B); % this willgive the number of occurences of each unique element best NS on 26 Feb 2019 simple and clear explaination. Other MathWorks country How to add White Gaussian Noise to Signal using MATLAB ? You can see that the bins for 2 and 3 both have 2 counts so there are multiples of 2 and 3 in A. repeats, call the diff() function and look for zeros. that is shorter than any such path that does not use the vertex Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Turn an Array into a Column Vector in MATLAB. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. k @LuisMendo Yes, that input is also possible. r MATLAB: Count how many times a number is repeated in a certain row of an array MATLAB Please consider the array A = [ 1;1;1;2;2;2;2;2;3;3;4;4;4;4;4;4;4;5;5;5;5]; I would like to determine how many times each number repeats. By definition, this is the value {\displaystyle N} = to each How to remove all duplicates from an array of objects? Consider a vector in MATLAB, where some elements are repeated. I would like to know why this error occurs and try to fix it. i {\displaystyle i} t Find in a cell array? Optimal routing. If I apply Matlab's instructions for exporting a table: filename = 'data. k s } Thank you for the answer, it definitely gets the job done. Could very old employee stock options still be accessible and viable? What happened to Aham and its derivatives in Marathi? h At k = 1, paths that go through the vertex 1 are found: in particular, the path [2,1,3] is found, replacing the path [2,3] which has fewer edges but is longer (in terms of weight). t Connect and share knowledge within a single location that is structured and easy to search. using the vertices How to get distinct values from an array of objects in JavaScript? , j indexes = [indexes, find(A == repeatedElements(k))]; Arthur, with your new array A = [29892, 29051, 29051], my code. If a law is new but its interpretation is vague, can the courts directly ask the drafters the intent and official interpretation of their law? [7] The modern formulation of the algorithm as three nested for-loops was first described by Peter Ingerman, also in 1962.[8]. @Y.Chang Thanks! Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. | Find number of consecutive elements before value changes (MATLAB) Ask Question Asked 8 years, 9 months ago Modified 8 years, 9 months ago Viewed 4k times 1 I have a (row)vector of some size, containing the values 1,2 and 3. for all ) i e t {\displaystyle \Theta (|E|)} The FloydWarshall algorithm compares all possible paths through the graph between each pair of vertices. o To learn more, see our tips on writing great answers. V | a k t If there is other data in columns to the left of the array A, that does not follow the same repeating pattern. t . i To avoid overflow/underflow problems one should check for negative numbers on the diagonal of the path matrix within the inner for loop of the algorithm. You can get the unique values (here $[1, 2, 3, 7, 8]$) with, then you can count how many times each of these values appear in $v$ with. IT WORKED! The distance matrix at each iteration of k, with the updated distances in bold, will be: A negative cycle is a cycle whose edges sum to a negative value. pairs using any intermediate vertices. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. How can I find how many times each element in this vector is repeated without using a loop. My A is an arbitrary vector, like this one you used here. % Print them out and collect indexes of repeated elements into a cell array. , It returns 2 and 3. however, if you use: hist (a,b), then the repetitions are counted against the reference (b). = Error in setdiff>setdiffR2012a (line 505) c = unique(c,order); Error in setdiff (line 84) [varargout{1:nlhs}] = setdiffR2012a(varargin{:}); duplicateLocations = ismember( A, find( A( setdiff( 1:numel(A), uniqueIdx ) ) ) ). Accelerating the pace of engineering and science. o Matlab: find first and final occurrences of elements in a vector? , {\displaystyle k} , Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. In this article, we will discuss how to find duplicate values and their indices within an array in MATLAB. . h is significantly smaller than I'm inspired by Marsaglia's KISS random number generator: "Keep It Simple Stupid". This happens to be what you want/have, so you're in luck :). memory to store each tree which allows us to efficiently reconstruct a path from any two connected vertices. i ) It is able to do this with Difference between inv() and pinv() functions in MATLAB. s {\displaystyle \Omega (\cdot 6^{n-1}w_{max})} {\displaystyle \mathrm {shortestPath} (i,j,0)=\mathrm {edgeCost} (i,j)} Connect and share knowledge within a single location that is structured and easy to search. {\displaystyle i} h , ( a As the question edited, to manipulate non-consecutive duplicates you can do this: [s ii] = sort (a); x = [false ;s (2:end)==s (1:end-1)]; y = [x (2:end)|x (1:end-1) ;x (end)]; first = ~x&y; [~,ix]=sort (ii (first)); un (ix,1)=1:numel (ix); result (ii,1)=un (cumsum (first)). These formulas are the heart of the FloydWarshall algorithm. In our two by two grid, with the x_values and y_values arrays, all we need to do is a simple loop to get our unique_coordinates array, and pull off four coordinates at random: 1 2 3. ) For 2, it repeats five times, and so on. , Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. the data present in array A but not in B, without any data repetitions. t o h a | , {\displaystyle G} {\displaystyle 2n^{2}} j rev2023.3.1.43269. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. o Unable to complete the action because of changes made to the page. 0 Comments Sign in to comment. t , {\displaystyle j} 2 {\displaystyle j} s By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. MATLAB is a programming environment that is interactive and is used in scientific computing. Should I include the MIT licence of a library which I use from a CDN? The FloydWarshall algorithm typically only provides the lengths of the paths between all pairs of vertices. How to increase the number of CPUs in my computer? , s In this application one is interested in finding the path with the maximum flow between two vertices. o {\displaystyle \{1,2,\ldots ,k\}} P Download full answer. Not the answer you're looking for? 24/7 Live Expert. {\displaystyle \Theta (n^{3})} You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. {\displaystyle \mathrm {shortestPath} (i,j,k-1)} I have another question, can I get some case like, You may receive emails, depending on your. a a | k k Find centralized, trusted content and collaborate around the technologies you use most. I saw the solution with unique, and wanted to give a solution with loops. w Unable to complete the action because of changes made to the page.

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