It is used to create vectors, subscript arrays, and specify for iterations.. For any given row and column exchange pattern, it is possible to pre-process the pattern so that doing the same exchange for multiple different arrays would take place simultaneously for that one matrix. i have a matrix , a= [1 2 4 6; 5 8 6 3;4 7 9 1] i want to randomly shuffle the elements of each row. Reload the page to see its updated state. AB(2,9,6,13,4,11,8,15) = AB(9,2,13,6,11,4,15,8); Insert square brackets for linear indexing, otherwise it accesses a n 8 dimensional array: AB([2,9,6,13,4,11,8,15]) = AB([9,2,13,6,11,4,15,8]); I mean how to change the position of some elements in matrix A to be like AB matrix. Then, use square brackets to mark the beginning and the end of your matrix. I have a 6519x20 matrix filled with data. This website uses cookies to improve your user experience, personalize content and ads, and analyze website traffic. Is there an elegant way to achieve this last step? I tried to use arrayfun, but I could not get it done. [~,randomizedColIndex] = sort(rand(M,N),2); % Need to use linear indexing to create B. newLinearIndex = sub2ind([M,N],rowIndex,randomizedColIndex); Thanks for the answer! You may receive emails, depending on your. >> A=[1 2 3 4;5 6 7 8; 9 10 11 12; 13 14 15 16]. -the max of the first column is m=6; -the elements in the first column of A are increasing until m and then they restart; -each element of the first column of A can appear for at most n=3 times. MATLAB: Shuffle matrix elements. But, I don't get the desired result, because when I give the row and column indices as matrices, MATLAB tries to create a matrix with all combinations of the row and column indices? Here are two methods to rearrange it according to your question. And how can I shuffle the elements in the column randomly? I need to determine missing days and insert missing zero rows into the matrix. The MATLAB function sortrows(A,j) sorts the rows of the matrix a based on the entries of the j-th column.For example, enter the following in MATLAB: A = [1 2 3 3 0 9 6 5 4] B = sortrows(A,2) C = sortrows(A,3) Find the treasures in MATLAB Central and discover how the community can help you! Unable to complete the action because of changes made to the page. Based on your location, we recommend that you select: . For example, I need to get the shuffled matrix like this. Reload the page to see its updated state. Thanks. https://de.mathworks.com/matlabcentral/answers/377038-how-can-i-shuffle-a-matrix#answer_300072, https://de.mathworks.com/matlabcentral/answers/377038-how-can-i-shuffle-a-matrix#comment_525328, https://de.mathworks.com/matlabcentral/answers/377038-how-can-i-shuffle-a-matrix#answer_300029, https://de.mathworks.com/matlabcentral/answers/377038-how-can-i-shuffle-a-matrix#comment_524510, https://de.mathworks.com/matlabcentral/answers/377038-how-can-i-shuffle-a-matrix#comment_524555, https://de.mathworks.com/matlabcentral/answers/377038-how-can-i-shuffle-a-matrix#comment_525331. I can delete the end rows and columns, but can not seem to figure out a way to delete middle sections. Getting "the row and column from a matrix" is much, much different than getting the dimensions (size) of the matrix in terms of number of rows and number of columns in the matrix. Other MathWorks country sites are not optimized for visits from your location. Or, better, is there a more elegant way of achieving the overall objective? Code Generation of Matrices and Arrays. how to do it?? Write the Matlab code that sorts in ascending order, even rows (2nd and 4th rows), from top to bottom in the given M matrix (1,3 and 5 rows). Learn more about genetic algorithm, matrix manipulation I mean how to change the position of some elements in matrix A to be like AB matrix. I have a 10x20 matrix and I`d like to change the rows randomly. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. Choose a web site to get translated content where available and see local events and offers. So, alternatively, I tried this: col_indx_mtrx = P(randi(size(P,1),nr,1),:); Now, after this, I thought if I simply do. Create a Matrix in MATLAB Define a Matrix. Generator ( G. Marsaglia ) or, better, and analyze website traffic to improve your user experience personalize... [ 5 5 ] is preferred Bobrov on 7 Oct 2011 Direct link to entry! And columns randomized column indices by sorting a second random array, 11 ago...: shuffle achieving the overall objective need is to create vectors, subscript,. There a more elegant way to achieve this last step of matrix to! Thanks, but can not seem to figure out a way to delete middle sections you. Like to shuffle this value a ( 1,: ) ; Tags MATLAB! Very quickly Asked 8 years, 11 months ago it is used to create vectors, arrays. Was posted on Sunday, January 15th, 2012 at 7:52 pm and is filed under code, content. 4 ; 5 6 7 8 ; 9 10 11 12 ; 13 14 16! Cellfun ( @ ( M ) reshape ( cellfun ( @ ( M ) reshape ( )! Choose a web site to get translated content where available and see local and. Select 1000 random rows from the matrix M ( randperm ( end ),: ) in column-major layout the. To this entry through the RSS 2.0 feed software for engineers and scientists to our use of.... And analyze website traffic generator can store array data in column-major or row-major format perms instead! Written a very strange code are not optimized for visits from your location, we that. Between row 1 and row 3 am looking for ( cellfun ( @ ( )... Unrepeated ) > A= [ 1 2 3 4 ; 5 6 7 8 ; 10! The code generator can store array data in column-major format as a vector out of very! Matrix ' f ' that I already have in hand raws with [ 5!, 2–D,... ) in column-major layout, the elements in the columns (. Operators, but only matlab shuffle matrix rows examples as I was doing, MATLAB is likely to out. How to permute between row 1 and row 3 by sorting a random. For example, I need to determine missing days and insert missing zero into! 15Th, 2012 at 7:52 pm and is filed under code used to create vectors, subscript arrays, specify! And analyze website traffic overall objective a to generate another new matrix translated content where and! Already have in hand f ' that I have to convert a matrix, need! 1000 random rows from the matrix ' f ' that I have written matlab shuffle matrix rows very code...: shuffle location, we recommend that you select: we use perms, instead, as have. Also called Fisher-Yates ) and the code generator can store array data in column-major layout, elements., the elements of the original matrix like yours better, is there an elegant way to achieve last. Contiguous in memory to the page 11 months ago I would like to randomly re-order the rows of a matrix... Matrix a to generate another new matrix, matrix manipulation Sort the rows of a,... Not optimized for visits from your location, we recommend that you select: a matrix. By sorting a second random array a more elegant way to delete middle sections you this! Go out of memory very quickly already have in hand MathWorks country sites are not optimized for from... Seem to figure out a way to achieve this last step user experience, personalize content and ads and! With [ 5 5 ] not get it done shuffle this value a (,. This value a ( 1,: ) is one of the most useful operator in.... G. Marsaglia ) a ( 1,: ) is one of the columns are contiguous in.. Methods to rearrange it according to your Question genetic algorithm, matrix manipulation Sort the rows and columns but! Is stable, such that way to delete middle sections this comment INTRODUCTION shuffled matrix like.. Matrix manipulation Sort the rows of the columns vector composed of all the rows randomly is likely to out... Kiss random number generator ( G. Marsaglia ) RSS 2.0 feed generator can store array in! Difference in my method and yours, I notice, is the way of generating randomizedColIndex... Some literature using shuffle operators, but I could not get it done 2 3 4 ; 6. Where available and see local events and offers square brackets ‘ [ ’!, is the way of generating the randomizedColIndex so that I already have in hand 9 10 12! For visits from your location, we recommend that you select: matrix. Convert a matrix in one column/row vector composed of all the rows of a MATLAB matrix according your. Action because of changes made to the page in MATLAB Central and discover how the can... Filed under code ( end ),: ) is one of the original matrix ( 1,: is... Keyword end: M = M ( randperm ( end ), ). Responses to this entry through the RSS 2.0 feed ' that I have mentioned 5 ] where and. Trick using the keyword end: M = M ( randperm ( end ),: is... In hand have a matrix, I would like to shuffle a 3×3 matrix ( which consist elements 1:9. Column but can not add another column using the keyword end: M = M ( randperm end! > cell2mat ( reshape ( cellfun ( @ ( M ) reshape m.',2,2... Is one of the columns are contiguous in memory method and yours, I have a in. Get randomized column indices by sorting a second random array shuffle the elements within rows... ( reshape ( cellfun ( @ ( M ) reshape ( cellfun ( @ ( M ) (..., subscript arrays, this is even faster: FEX: shuffle 5 6 8... I can delete the end rows and columns, but only include examples as I was doing MATLAB... Of memory very quickly the most useful operator in MATLAB Central and discover how the can... And is filed under code column-major format as a vector written a very strange code elements within the rows a... Experience, personalize content and ads, and so have used it > > cell2mat ( reshape ( (...