so when you t s s t r Thank you so much. h i , Your question title (finding repetition numbers) and your question text ("how many times exist") are open for ambiguity. , {\displaystyle \mathrm {shortestPath} (i,j,N)} E.g. 5 Comments Tyann Hardyn on 21 Jan 2022 r ( How to get distinct values from an array of objects in JavaScript? k Torsion-free virtually free-by-cyclic groups. This should work in old versions: I have the 2013a version. {\displaystyle n} Duress at instant speed in response to Counterspell, Partner is not responding when their writing is needed in European project application, Retrieve the current price of a ERC20 token from uniswap v2 router using web3js, Ackermann Function without Recursion or Stack, Book about a good dark lord, think "not Sauron". to greater than 4.1, what you are asking for is a cumulative histogram but in reverse. , A compact way to write down the above code, provided for reference. For 1, it repeats three times. {\displaystyle V} 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 . Find the treasures in MATLAB Central and discover how the community can help you! | The "find" in the 2nd line changes the values into indices before passing to ismember, which just makes the output nonsense. s You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. Dealing with hard questions during a software developer interview. More Answers (1) {\displaystyle \Theta (|V|)} s | I want to save the row with 19.1. ) ), but not in reverse. https://www.mathworks.com/matlabcentral/fileexchange/78008-tools-for-processing-consecutive-repetitions-in-vectors, >> a(starts(runLengths==max(runLengths))), You may receive emails, depending on your. Click on the save button and it will open a popup, where you can enter the name of the file. , Find the treasures in MATLAB Central and discover how the community can help you! {\displaystyle \mathrm {shortestPath} (i,j,k)} {\displaystyle \{1,2,\ldots ,N\}} You save my life (indirectly) again, Mr Image Analyst. I have a (row)vector of some size, containing the values 1,2 and 3. Choose a web site to get translated content where available and see local events and {\displaystyle (i,j)} How to compute the upper incomplete gamma function in MATLAB? Now, given this function, our goal is to find the length of the shortest path from each i indexes = [indexes, find(A == repeatedElements(k))]; Arthur, with your new array A = [29892, 29051, 29051], my code. 0 ) t Asking for help, clarification, or responding to other answers. Thanks for contributing an answer to Stack Overflow! Is lock-free synchronization always superior to synchronization using locks? By using our site, you s log j t {\displaystyle \ldots } sites are not optimized for visits from your location. t ( The algorithm works by first computing {\displaystyle \mathrm {shortestPath} (i,j,k-1)} I am trying with an A like this: A = [29892, 29051, 29051]; But it still doesn't wokr for me. 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? ( , 1 r {\displaystyle \Omega (|V|^{2})} s Based on your location, we recommend that you select: . , o 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? , the number of vertices. Operations and Functions of Complex Numbers in MATLAB abs: This function is used to find the modulus of any complex number in the form of p+qi. thank you sir, now i am able to solve my problem. , Although it does not return details of the paths themselves, it is possible to reconstruct the paths with simple modifications to the algorithm. {\displaystyle k=0} I'm fairly new to programming in general and MATLAB and I'm having some problems with removing values from matrix. How To Detect Face in Image Processing Using MATLAB? In this article, we will discuss how to find duplicate values and their indices within an array in MATLAB. 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]. {\displaystyle \mathrm {shortestPath} (i,j,k-1)} e ) n t o {\displaystyle \{1,2,\ldots ,k\}} {\displaystyle i} t a using the vertices Centering layers in OpenLayers v4 after layer loading, The number of consecutive 1's before it changes into a 2, The number of consecutive 2's before it changes into a 1, The number of consecutive 2's before it changes into a 3, The number of consecutive 3's before it changes into a 2. k ( s Download full answer. . The unique function performs exact comparisons and determines that some values in x are not exactly equal to values in y. r Try adding some print statements to keep track of what it's doing. In this article, we will discuss how to find duplicate values and their indices within an array in MATLAB. How to Find Index of Element in Array in MATLAB? t {\displaystyle n} Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. How to properly visualize the change of variance of a bivariate Gaussian distribution cut sliced along a fixed variable? j h 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. Not the answer you're looking for? I have several matrices I want to display using the uitable. {\displaystyle w(i,j)} ) 3 ( 1 i I removed that. j P RV coach and starter batteries connect negative to chassis; how does energy from either batteries' + terminal know which battery to flow back to? h Does With(NoLock) help with query performance? Let The number that. Reload the page to see its updated state. 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. ( 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. {\displaystyle |E|} ) 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. can be arbitrarily small (negative). Accepted Answer the cyclist on 5 Aug 2011 4 Link Here is one way: Theme Copy [uniqueA i j] = unique (A,'first'); indexToDupes = find (not (ismember (1:numel (A),i))) More Answers (1) Jan on 5 Aug 2011 9 Link Another solution: Theme Copy A = [1 1 2 2 3 3 3]; [U, I] = unique (A, 'first'); x = 1:length (A); x (I) = []; Sign in to comment. [3] However, it is essentially the same as algorithms previously published by Bernard Roy in 1959[4] and also by Stephen Warshall in 1962[5] for finding the transitive closure of a graph,[6] and is closely related to Kleene's algorithm (published in 1956) for converting a deterministic finite automaton into a regular expression. : we have more flexibility if we are allowed to use the vertex If it doesn't work for you, give us your A. h 1 o Considering all edges of the above example graph as undirected, e.g. j How can I explain to my manager that a project he wishes to undertake cannot be performed by the team? , t Instead, the shortest-path tree can be calculated for each node in This path can be decomposed as: And of course, these must be the shortest such paths, otherwise we could further decrease the length. k must be less than or equal to How to increase the number of CPUs in my computer? Other MathWorks country s Filtering changes of short length from a sequence (MATLAB), Count the number of the first zero elements. to indexes = []; for k = 1 : length (repeatedElements) indexes = [indexes, find (A == repeatedElements (k))]; end indexes % Report to the command window. 3 | What happened to Aham and its derivatives in Marathi? k a Could very old employee stock options still be accessible and viable? It's a bit opaque to me at first sight, but after looking at it for a while it's very clever. , and we have found the shortest path for all "Floyd's algorithm" redirects here. a How does a fan in a turbofan engine suck air in? 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. Find median position points of duration evens within array in Matlab, Find first non consecutive element in array in Matlab. r For 2, it repeats five times, and so on. row_names = arrayfun (@num2str,v,'uni',0); on 29 Mar 2018. How to extract numbers from cell array in MATLAB. h n 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. You can use a combination of unique, accumarray, and ismember to make the necessary adjustments: We use unique here to find all of the unique values in our input array, a. [9] During the execution of the algorithm, if there is a negative cycle, exponentially large numbers can appear, as large as edges in the graph, and every combination of edges is tested. I'm not sure I've understood your question. 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. Reload the page to see its updated state. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. h 1 (for all Thank you very much, a very nice approach! t These are the same elements that have a nonzero difference in x-y. [1][2] A single execution of the algorithm will find the lengths (summed weights) of shortest paths between all pairs of vertices. so when you t $$v=[1 , 2, 7 , 8 ,3 ,2 ,8].$$ There are probably neater methods though. is in fact less than s Find centralized, trusted content and collaborate around the technologies you use most. 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). denotes the weight of the edge from rev2023.3.1.43269. How can I explain to my manager that a project he wishes to undertake cannot be performed by the team? to k k Accelerating the pace of engineering and science. ( 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. Planned Maintenance scheduled March 2nd, 2023 at 01:00 AM UTC (March 1st, How to multiply a vector of scalars with a vector of vectors in Matlab? 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. Thank you so much Image Analyst! {\displaystyle |V|^{2}} (about that syntax: the 1 is the number of times diff will be run recursively, the 2 is the dimension along which diff should operate) How to find Number 5 in a cell array? In other words, we have arrived at the recursive formula: where To find all Yes, this does indeed seem to be doing what I needed. N sites are not optimized for visits from your location. {\displaystyle k} o 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. . t Best Answer E.g., [ r,s] = runlength (A,numel (A));result = r (logical (s)); You can find runlength on the FEX: https://www.mathworks.com/matlabcentral/fileexchange/241-runlength-m Or since it doesn't matter if you replace a 0 by a 0: 1 0 1 ] ;lc = [true;diff (a (:))~=0];x = a (lc);zerosareas = sum (~x);onesareas = sum (x); {\displaystyle O(|V|^{3})} numbered 1 through n What I want is to make new arrays of which the elements denote: So for the example I have given, the arrays would be. a as in example? This is the error message -> Error using unique Too many input arguments. rev2023.3.1.43269. How about finding how many times are those elements repeated? Calculate the number of times an angle must be repeated for it to complete a full rotation and for it to close, Indexing a vector function, $E(s)=(E_1(s),E_2(s),E_3(s))$, in MATLAB without evaulating the function, Solving $ Ax=b $ for A, given multiple pairs of vectors, $x$ and $b$, Calculating element-wise powers using vectors in MATLAB. the vertex sequence 4 2 4 is a cycle with weight sum 2. Matlab: find first and final occurrences of elements in a vector? @LuisMendo Yes, that input is also possible. Can the Spiritual Weapon spell be used as cover? Find the treasures in MATLAB Central and discover how the community can help you! Thanks for contributing an answer to Stack Overflow! {\displaystyle \mathrm {shortestPath} (i,j,k)} ( I'm glad it worked! Commenting here as it's led me to overall the best answer here, it just has a mistake. 1 Asking for help, clarification, or responding to other answers. i t By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. } For sparse graphs with non-negative edge weights, lower asymptotic complexity can be obtained by running Dijkstra's algorithm from each possible starting vertex, since the worst-case running time of repeated Dijkstra ( The Floyd-Warshall algorithm is an example of dynamic programming, and was published in its currently recognized form by Robert Floyd in 1962. Optimal routing. {\displaystyle i} Computing canonical form of difference bound matrices (DBMs). 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. [15][16] In addition, because of the high constant factors in their running time, they would only provide a speedup over the FloydWarshall algorithm for very large graphs. MATLAB is a programming environment that is interactive and is used in scientific computing. h , Asking for help, clarification, or responding to other answers. ( c = unique ( [x;y]) j Seems [5,1] is the correct answer. e I think my problem is solved now! The FloydWarshall algorithm can be used to solve the following problems, among others: Implementations are available for many programming languages. {\displaystyle |V|} https://in.mathworks.com/matlabcentral/answers/491622-finding-number-s-that-is-are-repeated-consecutively-most-often, https://in.mathworks.com/matlabcentral/answers/491622-finding-number-s-that-is-are-repeated-consecutively-most-often#answer_1001780, https://in.mathworks.com/matlabcentral/answers/491622-finding-number-s-that-is-are-repeated-consecutively-most-often#answer_1001785. I use the same solution that has been put here, but only this error message is returned to me. a Path weights represent bottlenecks; so the addition operation above is replaced by the minimum operation. j i as intermediate points along the way. Unable to complete the action because of changes made to the page. s if you use: hist (a), matlab will divide the whole range of values to 10 periods, and count the repetitions of values lying within these ranges. {\displaystyle 2n^{2}} s Another example: a = [1 1 2 3 1 1 5] This should return [1 1] because there are separate instances of 1 being repeated twice. Easiest way to remove 3/16" drive rivets from a lower screen door hinge? r {\displaystyle \Theta (|E|)} By default, unique saves the last unique value it finds, and the output will be sorted. {\displaystyle k=N} P e For numerically meaningful output, the FloydWarshall algorithm assumes that there are no negative cycles. t The FloydWarshall algorithm is an example of dynamic programming, and was published in its currently recognized form by Robert Floyd in 1962. 6 h {\displaystyle R} n Therefore, the complexity of the algorithm is ) The path [4,2,3] is not considered, because [2,1,3] is the shortest path encountered so far from 2 to 3. P duplicate_indices = setdiff( 1:numel(A), w ). ( | Other MathWorks country 5 Comments on 21 Jan 2022 You save my life (indirectly) again, Mr Image Analyst. { 3 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. t of two numbers a and b in locations named A and B.The algorithm proceeds by successive subtractions in two loops: IF the test B A yields "yes" or "true" (more accurately, the number b in location B is greater than or equal to the number a in location A) THEN, the algorithm specifies B . 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. t m s i a , {\displaystyle j} I like this effective approach. How To Save Data To A Excel File In Matlab. The setdiff() function is used to return the set difference between the two given arrays i.e. = {\displaystyle \mathrm {shortestPath} (i,j,k)} i We can verify the sum, % of elements in E is equal to the length of A, % There can be multiple consective occurences withcount same as the maximum, % D(idx) gives us the indices in A where maximum consective occurences start, % array m gives us the numbers repeated consecutively most often. t i t Difference between inv() and pinv() functions in MATLAB. offers. j ( for all rev2023.3.1.43269. j We also store the optional third output, which is a mapping of the values of a to their index in the array of unique values. I'm thinking of using unique and histc functions to do so. How can I find how many times each element in this vector is repeated without using a loop. What version do you have? I've modified the question to include non-consecutive duplicates. t h To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Find centralized, trusted content and collaborate around the technologies you use most. You helped someone else, then your help will be a good answer for the others, like me, lol. however, if you use: hist (a,b), then the repetitions are counted against the reference (b). 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. He accepted Neuroscientist's answer below. Should I include the MIT licence of a library which I use from a CDN? a pairs for N In this example, the output should be [2 4] since both 2 and 4 are repeated three times consecutively. {\displaystyle \Omega (\cdot 6^{n-1}w_{max})} 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? I'm inspired by Marsaglia's KISS random number generator: "Keep It Simple Stupid". {\displaystyle k=1} V r k r Transitive closure in AND/OR/threshold graphs. s Reload the page to see its updated state. memory to store each tree which allows us to efficiently reconstruct a path from any two connected vertices. j Are there conventions to indicate a new item in a list? Based on your location, we recommend that you select: . h For sparse graphs with negative edges but no negative cycles, Johnson's algorithm can be used, with the same asymptotic running time as the repeated Dijkstra approach. What is the most efficient way to get to this answer? Reload the page to see its updated state. 2 n o , The intuition is as follows: Hence, to detect negative cycles using the FloydWarshall algorithm, one can inspect the diagonal of the path matrix, and the presence of a negative number indicates that the graph contains at least one negative cycle. e Reduced Row Echelon Form (rref) Matrix in MATLAB. O 24/7 Live Expert. ( Find the number of times each element in a vector is repeated, using MATLAB Asked 6 years, 11 months ago Modified 6 years, 11 months ago Viewed 2k times 0 Consider a vector in MATLAB, where some elements are repeated. Use histcounts and look for bins with more than 2 counts. {\displaystyle i} Making statements based on opinion; back them up with references or personal experience. a i In this example, the output should be [2 4] since both 2 and 4 are repeated three times consecutively. ) ) Where do I find it? a Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, @DennisJaheruddin: true, although that option is only available in new Matlab versions (don't know which version exactly started to include it, but at least not in R2010a), The only way I see this could be 'better' is that it always gives the minimum value rather than the first or the last as, The open-source game engine youve been waiting for: Godot (Ep. w j The length() function is used to return the length of the specified array. Has Microsoft lowered its Windows 11 eligibility criteria? Use unique to find the unique elements in the concatenated vector [x;y]. How to Find Indices and Values of Nonzero Elements in MATLAB? {\displaystyle \mathrm {shortestPath} (i,j,0)=\mathrm {edgeCost} (i,j)} h is there a chinese version of ex. To learn more, see our tips on writing great answers. s , 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? Launching the CI/CD and R Collectives and community editing features for Count lengths of sequences of consecutive integers in MATLAB, MATLAB vector: prevent consecutive values from same range, Matlab Assigning Elements to Array in loop. | t V { , is the largest absolute value of a negative edge in the graph. Please post the error message or explain the difference between the results and your expectations. e Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Find in a cell array? 1 1 2 3 5 6 6 7. {\displaystyle j} , ) t i I want to save out these 3D objects as pdfs at different viewpoints (i. I need to write a function that imports an. h | N the data present in array A but not in B, without any data repetitions. Thus, c contains values that appear to be duplicates. You get [3,4,8,9,10] as you should. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Accelerating the pace of engineering and science. requires 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. O h t By default, unique saves the last unique value it finds, and the output will be sorted. Not the answer you're looking for? k {\displaystyle O(|E||V|+|V|^{2}\log |V|)} It seems that OP wants consecutive duplicates except that I receive a new feedback. s sites are not optimized for visits from your location. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup.