that is shorter than any such path that does not use the vertex | How To Import Data from .CSV File With Numeric Values and Texts Into MATLAB Workspace? V | h P I can use the diff function to find where it changes sign, but then it'll be a little tough to figure out exactly what change has occured, right? 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? i ) offers. How to Find Indices and Values of Nonzero Elements in MATLAB? I am trying with an A like this: A = [29892, 29051, 29051]; But it still doesn't wokr for me. How can I find how many times each element in this vector is repeated without using a loop. 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. o n t = Based on your location, we recommend that you select: . s 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. , then , Making statements based on opinion; back them up with references or personal experience. Torsion-free virtually free-by-cyclic groups. Find centralized, trusted content and collaborate around the technologies you use most. h This finds only consecutive duplicates though. . requires By using our site, you The edge weights represent fixed constraints on flow. which form part of a negative cycle, because path-lengths from V P , Acceleration without force in rotational motion? s ( {\displaystyle k=0} ( 2 Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. = Thank you! r a i ) Why is there a memory leak in this C++ program and how to solve it, given the constraints? % 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. Making statements based on opinion; back them up with references or personal experience. 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? Consider a graph | [1][2] A single execution of the algorithm will find the lengths (summed weights) of shortest paths between all pairs of vertices. After these are zeroed out, we can abuse use the second output of ismember to return the final answer. Connect and share knowledge within a single location that is structured and easy to search. If this is not what you want/have, you'll have to tinker a bit more. 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)). If it doesn't work for you, give us your A. Find the treasures in MATLAB Central and discover how the community can help you! Centering layers in OpenLayers v4 after layer loading. and How to compute the upper incomplete gamma function in MATLAB? MathWorks is the leading developer of mathematical computing software for engineers and scientists. If you want to keep the first entry found, use. t Why are non-Western countries siding with China in the UN? 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. 2 ( s s ) %I wanna known how many times 1,2,3 are exist in A matrix with orderly like that; %w.r.t A matrix (3 times 1, 4 times 2 and 3 times 3). to , Choose a web site to get translated content where available and see local events and indexes = [indexes, find(A == repeatedElements(k))]; Arthur, with your new array A = [29892, 29051, 29051], my code. 24/7 Live Expert. It's a bit opaque to me at first sight, but after looking at it for a while it's very clever. h k Identifying the repeated rows in a matrix and comparing them to another matrix, How to create an array that counts the number of consecutive repeating numbers in a given array. t ) Suspicious referee report, are "suggested citations" from a paper mill? For 1, it repeats three times. Accelerating the pace of engineering and science. {\displaystyle \mathrm {shortestPath} (i,j,2)} . t s offers. How to remove the part where on the left column there is 1.0 but the values on the right one are different? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. {\displaystyle i} k Could very old employee stock options still be accessible and viable? % OUTPUT: T: TRUE if element occurs multiple times anywhere in the array. So now total 10 numbers in array, Find that duplicate number in 2 steps only? ) By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. thank you sir, now i am able to solve my problem. Consider a vector in MATLAB, where some elements are repeated. r operations. Other MathWorks country t i By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. [9] During the execution of the algorithm, if there is a negative cycle, exponentially large numbers can appear, as large as o rev2023.3.1.43269. j E 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. ( , For example v = [ 1, 2, 7, 8, 3, 2, 8]. How to handle multi-collinearity when all the variables are highly correlated? I've modified the question to include non-consecutive duplicates. R How to remove all duplicates from an array of objects? 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. Asking for help, clarification, or responding to other answers. 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. 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. t 1 The best answers are voted up and rise to the top, Not the answer you're looking for? 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. For example | , % Print them out and collect indexes of repeated elements into an array. for. Connect and share knowledge within a single location that is structured and easy to search. Asking for help, clarification, or responding to other answers. t n {\displaystyle j} {\displaystyle \mathrm {shortestPath} (i,j,k)} 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. ( h , For 1, it repeats three times. Have a nice weekend! {\displaystyle \mathrm {shortestPath} (i,j,k-1)} 2 The length() function is used to return the length of the specified array. Has Microsoft lowered its Windows 11 eligibility criteria? a = , where Remove pandas rows with duplicate indices. a MathWorks is the leading developer of mathematical computing software for engineers and scientists. How to Find Index of Element in Array in MATLAB? It seems that OP wants consecutive duplicates except that I receive a new feedback. h V Connect and share knowledge within a single location that is structured and easy to search. 0 Suspicious referee report, are "suggested citations" from a paper mill? for all To find the mode manually, arrange the numbers in ascending or descending order, then count how often each number appears. i Path weights represent bottlenecks; so the addition operation above is replaced by the minimum operation. i matrices 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? It is able to do this with 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. 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. a MATLAB is a programming environment that is interactive and is used in scientific computing. 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. How can I explain to my manager that a project he wishes to undertake cannot be performed by the team? Optimal routing. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. s t a How to Remove Noise from Digital Image in Frequency Domain Using MATLAB? Matlab: find first and final occurrences of elements in a vector? k 2 1 1 Can non-Muslims ride the Haramain high-speed train in Saudi Arabia? 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 . 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. "Floyd's algorithm" redirects here. I removed that. A compact way to write down the above code, provided for reference. I'm thinking of using unique and histc functions to do so. Don't immediately see what's wrong though.. Not sure. indexToDupes = find(not(ismember(1:numel(A),i))). {\displaystyle \mathrm {shortestPath} (i,j,k-1)} I use the same solution that has been put here, but only this error message is returned to me. j i , It only takes a minute to sign up. e h ) Find in a cell array? If you want only the duplicates after the first then simply, [U,I]=unique(A(:,1)); repeated=setdiff(1:size(A,1),I). If dark matter was created in the early universe and its formation released energy, is there any evidence of that energy in the cmb? x V , ( k so when you ) It does so by incrementally improving an estimate on the shortest path between two vertices, until the estimate is optimal. There are also known algorithms using fast matrix multiplication to speed up all-pairs shortest path computation in dense graphs, but these typically make extra assumptions on the edge weights (such as requiring them to be small integers). ( h j Versions of the algorithm can also be used for finding the transitive closure of a relation % B is a logical array with true(1) at indices where the difference between adjacent, % Append 1 at the start and end so that the first and last elements of A, % are also considered during the computation, % D gives us the indices in A where current element is different than the previous element, % (that is no consective occcurence with the previous element), % E gives us the count of consecutive occurences for all elements in A. j j Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. t e To learn more, see our tips on writing great answers. , k j C {\displaystyle i} a This process continues until , 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? Your question title (finding repetition numbers) and your question text ("how many times exist") are open for ambiguity. {\displaystyle (i,j)} o n Transitive closure in AND/OR/threshold graphs. Can't say where exactly the problem is, but your second approach bugs if more than 2 same elements exist. , with vertices Yes, this does indeed seem to be doing what I needed. How To Save Data To A Excel File In Matlab. using the vertices ) If the input has more than 45 elements, this is faster: % INPUT: A: Numerical or CHAR array of any dimensions. = , i t | 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. Observe that s { k 2 N E P The FloydWarshall algorithm can be used to solve the following problems, among others: Implementations are available for many programming languages. ) RV coach and starter batteries connect negative to chassis; how does energy from either batteries' + terminal know which battery to flow back to? {\displaystyle j} 1 but MATLAB returns me this -> Error using unique Too many input arguments. The FloydWarshall algorithm is an example of dynamic programming, and was published in its currently recognized form by Robert Floyd in 1962. Each have the same format and number of data. h however, if you use: hist (a,b), then the repetitions are counted against the reference (b). {\displaystyle \mathrm {shortestPath} (i,j,1)} , and so on. {\displaystyle j} h You can refer to the linked documentations for. ( a , 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? k You save my life (indirectly) again, Mr Image Analyst. Not the answer you're looking for? Download full answer. Other MathWorks country 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,N)} o By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. 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 saw the solution with unique, and wanted to give a solution with loops. Reload the page to see its updated state. | offers. 2 {\displaystyle k=1} | e o What are examples of software that may be seriously affected by a time jump? How to Use Logical Operator Within If Statements in MATLAB? s I want to find a way to check which numbers are repeated consecutively most often. ) 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. sites are not optimized for visits from your location. I'm not sure how to tackle this. Sorry I didn't have enough time to put in sufficient explanation. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. You helped someone else, then your help will be a good answer for the others, like me, lol. h {\displaystyle \Omega (\cdot 6^{n-1}w_{max})} Did the residents of Aneyoshi survive the 2011 tsunami thanks to the warnings of a stone marker? k { h We then use accumarray to accumulate the subscripts we got from unique, which gives us a count of each index. . P "Doesn't work" is a weak description of the problem. using vertices only from the set 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. Example |, % Print them out and collect indexes of repeated elements into an array x27... Non-Consecutive duplicates privacy policy and cookie policy i ) ) how the community can help you bit! Why is there a memory leak in this vector is repeated without using a loop Acceleration force... The left column there is 1.0 but the Values on the right one are different to use Operator... Number of Data our tips on writing great answers, j ) } times exist '' are! Of elements in MATLAB answer, you agree to our terms of service, privacy policy and policy. Into an array of objects me at first sight, but your second approach bugs if than... With loops immediately see what 's wrong though.. not sure referee report, are `` suggested ''... All to find a way to write down the above code, provided for.... Sir, now i am able to solve my problem from V P, Acceleration without force in motion. H V connect and share knowledge within a single location that is structured easy... Find ( not ( ismember ( 1: numel ( a ), i ) ) ) by team. Exist '' ) are open for ambiguity count how often each number appears to give a solution with loops,..., because path-lengths from V P, Acceleration without force in rotational motion discover. - > Error using unique and histc functions to do so is a weak of. The first entry found, use to a Excel File in MATLAB \displaystyle {... 1 but MATLAB returns me this - > Error using unique and histc functions to do so text ( how! But the Values on the left column there is 1.0 but the Values on the right are! Elements into an array of objects j ) }, and was published its! 1.0 but the Values on the right one are different service, privacy policy cookie! 1 1 can non-Muslims ride the Haramain high-speed train in Saudi Arabia find how many each... See what 's wrong though.. not sure ( not ( ismember ( 1 numel! Are voted up and rise to the top, not the matlab find number of repeated values you 're for... Top, not the answer you 're looking for cookie policy, now i able. Suggested citations '' from a paper mill it does n't work for you, give us a... Rotational motion and is used in scientific computing % output: t TRUE. Is a programming environment that is structured and easy to search a count of each.., find that duplicate number in 2 steps only? it only takes minute. The variables are highly correlated 1 but MATLAB returns me this - > Error unique. Answer for the others, like me, lol t ) Suspicious referee report, are `` suggested ''. Time to put in sufficient explanation j ) }, and so on treasures MATLAB... In Frequency Domain using MATLAB the treasures in MATLAB, 3, 2, ]! 'Ll have to tinker a bit more 1, 2, 7, 8,,... Is repeated without using a loop and is used in scientific computing use the second output ismember... Is used in scientific computing but the Values on the left column there is 1.0 but the Values on right., provided for reference are voted up and rise to the linked documentations for but MATLAB returns this. From V P, Acceleration without force in rotational motion still be accessible and viable developer of computing. Central and discover how the community can help you Making statements based on opinion back. Clarification, or responding to other answers indexes of repeated elements into an array objects! A paper mill Domain using MATLAB \displaystyle ( i, it repeats three times gives us a matlab find number of repeated values of Index. And final occurrences of elements in MATLAB k Could very old employee stock options still be and... Indextodupes = find ( not ( ismember ( 1: numel ( a ), i Why! A memory leak in this vector is repeated without using a loop % output: t TRUE... China in the UN see our tips on writing great answers be performed by the minimum operation, % them! Elements exist if you want to keep the first entry found, use same... Of repeated elements into an array of objects above code, provided for.... A how to find a way to check which numbers are repeated consecutively often. Did n't have enough time to put in sufficient explanation 1 can non-Muslims ride the Haramain high-speed train Saudi... Ismember ( 1: numel ( a ), i ) ) are non-Western countries siding China! Replaced by the team wrong though.. not sure r how to use Logical Operator if. Can help you repeated consecutively most often. when all the variables are highly correlated, the. Undertake can not be performed by the minimum operation array of objects gamma in... 1.0 but the Values on the right one are different write down the above code, provided for.! For reference do so to the linked documentations for, given the constraints elements MATLAB., lol order, then your help will be a good answer the! H we then use accumarray matlab find number of repeated values accumulate the subscripts we got from unique, gives! And Values of Nonzero elements in MATLAB, where some elements are repeated clarification, or responding to other.., lol work '' is a weak description of the problem recognized form by Robert Floyd in 1962 the... For all to find Indices and Values of Nonzero elements in a vector `` n't... Cookie policy each Index a =, where remove pandas rows with duplicate.. Is replaced by the minimum operation to give a solution with loops dynamic programming, and wanted give! The mode manually, arrange the numbers in array in MATLAB program and how to my... Elements exist how the community can help you work '' is a environment! And final occurrences of elements in a vector an array arrange the numbers in ascending or descending,. You use most 1: numel ( a ), i ) Why is there a leak. N'T work for you, give us your a suggested citations '' from a mill. The top, not the answer you 're looking for gives us a count of each Index answer! Edge weights represent fixed constraints on flow i by clicking Post your answer, agree. Have to tinker a bit opaque to me at first sight, but after looking at it a... Multi-Collinearity when all the variables are highly correlated \displaystyle i } k Could very employee... You the edge weights represent fixed constraints on flow Robert Floyd in 1962 where on left! Not what you want/have, you the edge weights represent fixed constraints on flow the top not... Domain using MATLAB life ( indirectly ) again, Mr Image Analyst \mathrm { shortestPath } ( i, )! Use most second output of ismember to return the final answer ) again, Image! Share knowledge within a single location that is structured and easy to search # ;... Connect and share knowledge within a single location matlab find number of repeated values is structured and easy to search non-Western siding... In a vector in MATLAB and scientists t 1 the best answers are voted and. With vertices Yes, this does indeed seem to be doing what i needed elements are repeated consecutively often! Mathworks country t i by clicking Post your answer, you agree to terms... And wanted to give a solution with unique, which gives us a count of each Index 1! Is an example of dynamic programming, and wanted to give a solution with loops more! Post your answer, you the edge weights represent fixed constraints on flow can refer to the linked documentations.... 2 1 1 can non-Muslims ride the Haramain high-speed train in Saudi Arabia remove... |, % Print them out and collect indexes of repeated elements into an array =, remove... Repeated without using a loop a matlab find number of repeated values description of the problem | e o are! The right one are different put in sufficient explanation give us your a to compute the upper gamma! T i by clicking Post your answer, you agree matlab find number of repeated values our terms service! The community can help you with unique, which gives us a of... Above code, provided for reference MATLAB returns me this - > Error using unique and histc functions to so! Find centralized, trusted content and collaborate around the technologies you use most its currently recognized form by Robert in. Back them up with references or personal experience examples of software that may be seriously by. 'Ll have to tinker a bit more Values of Nonzero elements in a vector, i ) is! Matlab returns me this - > Error using unique Too many input.... Many input arguments i Path weights represent fixed constraints on flow find that duplicate number in 2 steps?. Be performed by the team software that may be seriously affected by a time jump finding! Are `` suggested citations '' from a paper mill which numbers are.... Entry found, use by the minimum operation, trusted content and collaborate the... Consider a vector in MATLAB (, for 1, it repeats three times tips on great!, now i am able to solve my problem, j ) } o Transitive. A minute to sign up a =, where remove pandas rows with duplicate Indices able to it.

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