Choose a web site to get translated content where available and see local events and Extract data from MATLAB matrix without for-loop, MATLAB: Subtracting matrix subsets by specific rows, matlab remove for loop in matrix computation, MATLAB: find means of other rows in a matrix without loop. In that, there is a "pushbutton" if the user wants to remove the rows. For simple example, let's have a 10x10 matrix A: A=[1:10; 901:910; 201:210; 301:310; 701:710; 401:410; 601:610; 501:510; 801:810; 101:110]; And I want to remove (for better illustration just replace with ones) that rows from fourth to the last, whose third columns contain value higher than 600. You can delete an entire row or column of a matrix by assigning an empty set of square braces [] to that row or column. offers. Find the treasures in MATLAB Central and discover how the community can help you! So putting everything together gives. Are defenders behind an arrow slit attackable? '<600]), The first 3 ones are because you always want the first 3 lines. Make an n x n-1 matrix from 1 x n vector where the i-th row is the vector without the i-th element, without a for loop, Matlab - removing rows and columns from a matrix that contain 0's, Compare two unequal column matrix in matlab without using for loop, Choose multiple values from multiple rows and columns from matrix in matlab, create a matrix without using loop or nested loop operations in MATLAB, Deleting rows from a Matlab cell matrix which match a given pattern, Extracting last (non NaN) 200 columns from matrix with varying number of NaNs ending the rows, apply matrix randomisation without for loop in matlab, Process a matrix in matlab without for loop, MATLAB Remove Only Certain Zeros from Matrix, Selecting entries from a matrix without using a loop, Calculating the histogram of a matrix without using a for loop in matlab. Matlab's 'cov' function will obtain the covariance of a matrix where the different columns are different components of random variables and the rows are different variations of those rows. Other MathWorks country Why is MATLAB so fast in matrix multiplication? For example, suppose I want to delete the last two rows of a matrix: tst= [1 1 1; 2 2 2; 3 3 3]; lastn=2; tic tst ( (end- (lastn-1)):end,:)= []; toc This works, but it seems quite expensive: "Elapsed time is 0.001152 seconds." How to remove the last row in a matrix?. So it means rows 1 through the end-2 and all columns of those rows. sites are not optimized for visits from your location. shift the elements of a vector by non-integer shift in matlab; im2double giving 1*1 matrix on applying to 256*256 matrix in matlab R2014a; Featured post. A matrix which has m rows and n columns is called a matrix of order m n. P-value from Tukey q (studentized range distribution) score. How to remove the last row in a matrix?. So putting everything together gives. What is the opencv equivalent to matlab's fliplr()? Choose a web site to get translated content where available and see local events and something like: Command to delete last row and column of a matrix - MATLAB Answers - MATLAB Central Productos Soluciones Educacin Soporte Comunidad Eventos Obtenga MATLAB MATLAB Answers Answers MATLAB Central Home Ask Answer Browse More Software de prueba Command to delete last row and column of a matrix Follow 271 views (last 30 days) Show older comments remove rows of matrix in matlab Choose multiple values from multiple rows and columns from matrix in matlab create a matrix without using loop or nested loop operations in MATLAB Deleting rows from a Matlab cell matrix which match a given pattern Extracting last (non NaN) 200 columns from matrix with varying number of NaNs ending the rows It can be represented by one or more rows (i) AND one or more columns (j). I have a problem with removing surplus rows in the end of the matrix. Add a new light switch in line with another switch? So should I understand that in Matlab rows and columns are not created equal? Lets say A is your 2x5 matrix. Learn more about guide, array . Share: 42,815 I am trying to make a cell array which splits the data into sets of 20 days. For simple example, let's have a 10x10 matrix A: A=[1:10; 901:910; 201:210; 301:310; 701:710; 401:410; 601:610; 501:510; 801:810; 101:110]; And I want to remove (for better illustration just replace with ones) that rows from fourth to the last, whose third columns contain value higher than 600. Kyle sexton. Manage SettingsContinue with Recommended Cookies. How can I index a MATLAB array returned by a function without first assigning it to a local variable? typedef bool (*remove_predicate) (const mat &rc); void remove_if(const mat &mat, mat &res, remove_predicate pred, bool removerows=true) { res.release(); int n = // returns true, if the item should get removed. How can you remove matrix rows in Matlab based on some criteria? For example, if the points are and , you. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. I really appreciate your taking the time to explain this to me. In MATLAB, you create a matrix by entering elements in each row as comma or space delimited numbers and using semicolons to mark the end of each row. what is the matlab way without loop to multiply a matrix with a vector (extending to the 3rd dim)? offers. We did this mainly. Sign in to comment. So I have a 36078x2 table. Removing Rows or Columns from a Matrix The easiest way to remove a row or column from a matrix is to set that row or column equal to a pair of empty square brackets []. Accelerating the pace of engineering and science. Find the treasures in MATLAB Central and discover how the community can help you! For more info read https://in.mathworks.com/help/matlab/matlab_prog/matlab-operators-and-special-characters.html MatLab - Padding arrays with something that wont be valued? They are stored as two-dimensional arrays in MATLAB. If you want to keep the old matrix. Andrew, could you transpose so that you are deleting columns instead of rows? I would like to delete the, say,the bottom 2 rows to get the new M=[3 6 3 7 9 11; 1 4 6 8 98 3]. No guarantees it'll be faster. MATLAB Commands - 7 Cell Array Functions cell Creates cell array. BTW, changing these rows to ones is just as easy: Copyright 2022 www.appsloveworld.com. This nearly works but for the last set which is DataE20(14) I get a 4x2 array instead of the wanted 4x20. To answer your question, you need to replace the matrix with a smaller matrix. i have complete matlab code for f (x)=x^2 up to selection. Based on your location, we recommend that you select: . How does legislative oversight work in Switzerland when there is technically no "opposition" in parliament? More Answers (6) Peter on 30 Nov 2012 31 Link Translate "I have a Matrix of 400 rows and 40 columns.I want to completely remove rows 3 and 9 to get a matrix with 398 rows. Unable to complete the action because of changes made to the page. I have found that this can be done in the following way. For example if one row contains the value "3, 4, 2, 1" then I would need . Does MATLAB java.util have non-hash map/set? . Where row_indices is the vector of indices you want to keep. Filter elements from a 3D matrix without loop, Remove for loop from clustering algorithm in MATLAB, Replace specific matrix position with array value without using for loop in MATLAB, MATLAB - work directly with indices of a matrix without using a loop, How would you remove the loop from this matlab code, MATLAB remove NaN values from matrix and shift values left, Creating a matrix from a vector with a specific indexing without a loop. Log in, to leave a comment. So we want: row_indices = find([1,1,1, A(4:end,3). Regarding your second question, I don't think there's a function for that exactly but you can simply average both rows and store them in a new vector X. I have found that this can be done in the following way. Math 75: The matrix of a linear transformation. I want to make sure that atleast 1 row remains. Unable to complete the action because of changes made to the page. could just type. Other MathWorks country To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Start a new MATLAB session without opening the editor window from the last session, MATLAB: find means of other rows in a matrix without loop, Get last row of many matrices (ASCII text files) and create a new matrix from these rows, How to avoid for loop in Matlab when building a new matrix from a database, construct a matrix by removing different elements from an array without loops in matlab, Extracting rows from .mat table using for loop in MATLAB, Equivalent of Matlab's PCA in Python sklearn, Rotate image in Matlab about arbitrary points, Time step computation in Matlab ODE solver, Imagesc function on Matlab: problems in converting 3D shapes in 2D, sum the first n prime reciprocals such that the sum exceeds k (Matlab), Sort all dimensions of a cell array from min to max in MATLAB. ", Compared to my way: "Elapsed time is 0.001152 seconds". I want to take the the first value in the first row, first column and compare it with all the other values in the second column. How to sort the rows of a multidimensional matrix in Matlab without changing the order of the elements in the first column? The column specifier is ":" which means "all". new_matrix is generated out of A by taking only the rows you want. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. function remove_button_Callback (hObject, eventdata, handles) % hObject handle to remove_button (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) % By default the remove button will only remove the last row in the % table dat = get (handles.eptable,'Data'); Is it possible to hide or delete the new Toolbar in 13.1? The consent submitted will only be used for data processing originating from this website. Therefor if you are keeping entire columns then the block of memory that needs to be copied to the new array is arranged sequentially in memory and can just be described as "starting address" and "number of items to copy". sites are not optimized for visits from your location. Result should look like that: and as @yoda said, to remove the rows do: Firstly your problem is that entering a matrix inside a matrix means use the values of the matrix as indices. It seems easy but I still keep on getting some weird outcomes. So we want: row_indices = find([1,1,1, A(4:end,3). Not the answer you're looking for? Accelerating the pace of engineering and science. If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page. of the matrix a, as created in the last section, . "1:end-2" specified rows from 1 through 2 before the last row. The Matlab expression B=all (A) is translated into Scilab by B=and (A): If A is a matrix, all (A) is equivalent to all (A,1) in Matlab whereas in Scilab and (A) is a logical AND of all elements of A. advection_pde , a MATLAB code which solves the advection partial differential equation (PDE) dudt + c * dudx = 0 in one spatial dimension, with a . The user with the push button, REMOVE can delete all the ROWS. your_matrix (end, :) = []; % deletes your matrix end (last) row your_matrix (:, end) = []; % deletes your matrix end (last) column Bhaskar R on 28 Jan 2020 Its a MATLAB syntax to remove elements from the matrix. since your matrix only has zeros and ones (as a result of the "<" operator) you got a weird result. Then create a new matrix C using the new vector X and the rows you want from your original matrix A. Row order is just your reference number (for vectors x. Matlab Arrayfun ..) which is click this siteof the fundamental things in MATLAB. Where row_indices is the vector of indices you want to keep. Command to delete last row and column of a matrix - MATLAB Answers - MATLAB Central Command to delete last row and column of a matrix Follow 287 views (last 30 days) Show older comments Swati Sarangi on 28 Jan 2020 0 Commented: Bhaskar R on 28 Jan 2020 Accepted Answer: Alex Mcaulley Hi, A reader asked in a blog comment recently why a vertical line (or edge) shows up in the Fourier transform of an image as a horizontal line. Compute mean value over a sliding window in MATLAB, Find each element that is less than some element to its right, MATLAB: Remove n last rows from matrix without loop, Remove zeros column and rows from a matrix matlab, how to remove only the desired row from the matrix and return the rest rows of a matrix using matlab, Extract rows from matrix in individual vectors without a for loop, matlab: delete zero rows from each matrix in cell-array without loop, Recover matrix X using pointers from rows in X to rows in matrix Y without doing loops in MATLAB, how to remove unwanted colors from a Matlab RGB image frame, without using a loop, Matlab: Filling up matrix rows using moving intervals from a column vector without a for loop, Removing rows and columns from MATLAB matrix quickly, Removing rows and columns from matrix in Matlab, Accessing the last few rows of a matrix using matlab, remove rows that contain zeros from cells array in matlab, Extract data from MATLAB matrix without for-loop, matlab remove for loop in matrix computation, How to remove Inf values from a matrix retaining its size in Matlab, Matrix multiplication of row and column without for loop in matlab, Build matrix with vectors resulting from indexed kronecker products without a for loop. To learn more, see our tips on writing great answers. Why am I getting this error when selecting files with uigetfile? Connect and share knowledge within a single location that is structured and easy to search. Basically, [] denotes an empty array. i knew how to do it, but to do this, you have to have M decleared before, i find myself with this problem all the time in matlab and obviously it is that i am missing something: for example i am calculating a convolution of signals (it is just an example of where i find myself with this issue), %for S1 and h i took simpler examples of arrays to be more clear, %my problem is that i want to cut the O1 to the same size as S1, % and h, as the rest of the convolution is going to be 0, so i would like to do something like this. So it means rows 1 through the end-2 and all columns of those rows. Then I want it to go to the row below it and carry out the same function and so on until the . How can I apply a function to every row/column of a matrix in MATLAB? because that is the easiest way to type in the rows. Is it acceptable to post an exam question from memory online? Ready to optimize your JavaScript with Rust? How do I arrange multiple quotations (each with multiple lines) vertically (with a line through the center) so that they're side-by-side? Sign in to comment. CGAC2022 Day 10: Help Santa sort presents! Hello. Conditional statement in matlab function argument, MATLAB: evaluation of a piecewise polynomial (pchip) with ppval, how to find the first element that has been seen twice in a vector, When to use "to workspace" block vs "outport" block, How to add a matrix( not the same dimension) below another matrix, imread() permission error after processing same images, To apply window function on Wigner-Ville Distribution in Matlab. Reload the page to see its updated state. To build that you can start with a zeros-ones vector and apply find (which will yield the indices with ones). informmation will be lost or get arranged in the matrix? https://fr.mathworks.com/matlabcentral/answers/115952-how-to-remove-the-last-row-in-a-matrix, https://fr.mathworks.com/matlabcentral/answers/115952-how-to-remove-the-last-row-in-a-matrix#answer_124182, https://fr.mathworks.com/matlabcentral/answers/115952-how-to-remove-the-last-row-in-a-matrix#comment_196074, https://fr.mathworks.com/matlabcentral/answers/115952-how-to-remove-the-last-row-in-a-matrix#comment_196076, https://fr.mathworks.com/matlabcentral/answers/115952-how-to-remove-the-last-row-in-a-matrix#comment_196090, https://fr.mathworks.com/matlabcentral/answers/115952-how-to-remove-the-last-row-in-a-matrix#comment_196100, https://fr.mathworks.com/matlabcentral/answers/115952-how-to-remove-the-last-row-in-a-matrix#comment_196271. Now you need to specify the columns since M is a 2-D matrix with both rows and columns. Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. Find the treasures in MATLAB Central and discover how the community can help you! By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. MathWorks Support Team on 27 Nov 2018 5 Link To extract any row from a matrix, use the colon operator in the second index position of your matrix. Did neanderthals need vitamin C from the diet? To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. If you want to remove individual elements then either use a cell array or replace those elements with some obsolete value such as 9999. offers. The comma separates the rows specifier from the column specifier. Work through this, typing the code into Sage. You may receive emails, depending on your. The size of the output vector will be. Learn more about guide, array MATLAB: Remove n last rows from matrix without loop. To build that you can start with a zeros-ones vector and apply find (which will yield the indices with ones). Would you please help? BTW, changing these rows to ones is just as easy: Thanks for contributing an answer to Stack Overflow! something like: B = unique (A,'rows') That will delete repeated rows in matrix A, hence the parameter 'rows'. Thank you so much. A = new_matrix. FFmpeg incorrect colourspace with hardcoded subtitles. how to remove first row of numpy array. Is this an at-all realistic configuration for a DHC-2 Beaver? How will that condition be inserted ? The dimension of the matrix resulting from a matrix multiplication is the first dimension of the first matrix by the last dimenson of the second matrix. If you have a matrix A and want to delete the 3rd and 9th rows, you can use the command: Theme A ( [3,9],:) = []; Thank you so much Jan! You may receive emails, depending on your. I have a problem with removing surplus rows in the end of the matrix. Confused about how to reshape my data, column for each day. new_matrix = A (row_indices, :) Where row_indices is the vector of indices you want to keep. Counterexamples to differentiation under integral sign, revisited, Why do some airports shuffle connecting passengers through security again. Based on All rights reserved. function remove_button_Callback (hObject, eventdata, handles) % hObject handle to remove_button (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) % By default the remove button will only remove the last row in the % table dat = get (handles.eptable,'Data'); % --- Executes on button press in remove_button. #include "opencv2/opencv.hpp" using namespace cv; #include using namespace std; // function to decide, which elements should be removed. Hi, I am trying to delete the bottom n rows of an N X 2 array. PSE Advent Calendar 2022 (Day 11): The other side of Christmas. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. A: No way: Matlab and Mathematica has a new feature called row index inside of an array in Python that is called RowOrderOf(x array, is that right? A matrix is an ordered rectangular array arrangement of numbers. To answer your question, you need to replace the matrix with a smaller matrix. The column specifier is ":" which means "all". MathWorks is the leading developer of mathematical computing software for engineers and scientists. Convert numeric array to cell array of chars and concat with chars in one line, Confusing syntax for Welch's PSD method in Matlab, Plotting or choosing nth pixel in a binary image MATLAB, How to get the THD value from the THD block in simulink into matlab, is there a way to do implicit differentiation in matlab, Matlab Solve Symbolic Function after rearranging for new subject, How to place a logo in an image using MATLAB. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. https://www.mathworks.com/matlabcentral/answers/7913-fast-way-to-delete-the-last-n-rows-of-a-matrix, https://www.mathworks.com/matlabcentral/answers/7913-fast-way-to-delete-the-last-n-rows-of-a-matrix#answer_10893, https://www.mathworks.com/matlabcentral/answers/7913-fast-way-to-delete-the-last-n-rows-of-a-matrix#comment_16800, https://www.mathworks.com/matlabcentral/answers/7913-fast-way-to-delete-the-last-n-rows-of-a-matrix#comment_806566, https://www.mathworks.com/matlabcentral/answers/7913-fast-way-to-delete-the-last-n-rows-of-a-matrix#comment_806568, https://www.mathworks.com/matlabcentral/answers/7913-fast-way-to-delete-the-last-n-rows-of-a-matrix#answer_10894, https://www.mathworks.com/matlabcentral/answers/7913-fast-way-to-delete-the-last-n-rows-of-a-matrix#comment_16802, https://www.mathworks.com/matlabcentral/answers/7913-fast-way-to-delete-the-last-n-rows-of-a-matrix#comment_16805, https://www.mathworks.com/matlabcentral/answers/7913-fast-way-to-delete-the-last-n-rows-of-a-matrix#comment_16807. Reload the page to see its updated state. Do you know if there is a faster way to delete the last n rows of a matrix? '<600]), The first 3 ones are because you always want the first 3 lines. In that, there is a "pushbutton" if the user wants to remove the rows. MathWorks is the leading developer of mathematical computing software for engineers and scientists. I would like to be able to delete the last n rows of a matrix. For example, suppose I want to delete the last two rows of a matrix: tst= [1 1 1; 2 2 2; 3 3 3]; lastn=2; tic tst ( (end- (lastn-1)):end,:)= []; toc This works, but it seems quite expensive: "Elapsed time is 0.001152 seconds." I will be able to use in the future what you have taught me. Other model components include a regression component to associate the same exogenous predictor variables to each response series, and constant and time . The comma separates the rows specifier from the column specifier. Best coding solution for query Matlab: Remove rows when first and last 2 elements are shuffled. I have found that this can be done in the following way. remove_button_Callback(hObject, eventdata, handles), % hObject handle to remove_button (see GCBO), % eventdata reserved - to be defined in a future version of MATLAB, % handles structure with handles and user data (see GUIDATA), % By default the remove button will only remove the last row in the. How to replace a column of a specific value with zeros in Matlab? With Sean's version to write to tst then the last rows would be thrown away. In general, I need to remove rows that contain a specific elements in a specific column, without using a loop. What is the solution of removing the last row? What happens if the permanent enchanted by Song of the Dryads gets copied? Using GUIDE, I have made a table. https://www.mathworks.com/matlabcentral/answers/66663-how-to-delete-the-last-n-elements-of-an-array, https://www.mathworks.com/matlabcentral/answers/66663-how-to-delete-the-last-n-elements-of-an-array#answer_78136, https://www.mathworks.com/matlabcentral/answers/66663-how-to-delete-the-last-n-elements-of-an-array#comment_478254, https://www.mathworks.com/matlabcentral/answers/66663-how-to-delete-the-last-n-elements-of-an-array#comment_478265, https://www.mathworks.com/matlabcentral/answers/66663-how-to-delete-the-last-n-elements-of-an-array#comment_828165. Is ther. Choose a web site to get translated content where available and see local events and Especially for larger blocks, there are often ways to optimize that at the machine level, such as by copying full system "pages" of memory using DMA. Using GUIDE, I have made a table. . Making statements based on opinion; back them up with references or personal experience. If any values are less than the value being compared with I want it to delete that entire row. For example, suppose I want to delete the last two rows of a matrix: This works, but it seems quite expensive: "Elapsed time is 0.001152 seconds." Find centralized, trusted content and collaborate around the technologies you use most. I don't know how to do it. Is there a more efficient way to remove fields and delete rows from a struct array? I would like to be able to delete the last n rows of a matrix. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. How to export enumerated list values from DOORS into cells or fields of MATLAB data; MATLAB: Removing 4 lines of header repeated every 14 lines & keeping 2nd/3rd columns of data in txt file If you do that then the portion that is left behind is contiguous in memory, and it should be faster to work with that than to have to copy over each partial column as you delete rows. It seems easy but I still keep on getting some weird outcomes. I would like to be able to delete the last n rows of a matrix. Accelerating the pace of engineering and science. MATLAB arranges memory in columns and the first entry for the next column is stored in memory directly after the last entry for this column. is this making a new one? I started out with 500,000 data points and im trying to minimize confusion between a half wave and a centre tapped full wave rectifier. since your matrix only has zeros and ones (as a result of the "<" operator) you got a weird result. new_matrix is generated out of A by taking only the rows you want. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. Variable appears to change size on every loop iteration - what. ), and more specifically RowOrderOf([1 2]) go to websitePython. O1=O1(1:100); but is it possible to do it in one line? Using pwelch to a set of signals: some questions (Matlab), Image rotation by Matlab without using imrotate, Distance between two pixels but belonging to different sets. Unable to complete the action because of changes made to the page. sites are not optimized for visits from your location. Correct. your location, we recommend that you select: . To answer your question, you need to replace the matrix with a smaller matrix. P=[1,2;2,3;4,5], entering each point at a time. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Using Matlab; Using Matlab and Excel; Using Matrix in Matlab; Using Python and Matlab; Using Array in Matlab . More Answers (6) Peter on 30 Nov 2012 Vote 31 Link Translate Home . For example, create a 4-by-4 matrix and remove the second row. Matlab-Matrix - Deletion of Row & Column, You can delete an entire row or column of a matrix by assigning an empty set of square braces [] to that row or column. Yes, I should be able to do that. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. Obtenir MATLAB; Produits; Solutions; Le monde acadmique; Support; For example, suppose that I have the matrix M=[3 6 3 7 9 11 5 34; 1 4 6 8 98 3 4 45]. MathWorks est le leader mondial des logiciels de calcul mathmatique pour les ingnieurs et les scientifiques. Based on In the last Matlab assignment, when plotting points, we put the points in the rows of a matrix. The typical goal here is just minimize the number of matrix resizing operations you have to do. In the United States, must state courts follow rulings by federal courts of appeals? A matrix having m rows and n columns is called a matrix of order m n or simply m n matrix. Theme Copy A = rand (2,5) Then to extract the first row, you simply use: Theme Copy V = A (1,:); Hector on 18 Nov 2022 at 16:36 Thank you Sign in to comment. Thanks. How to implement A = sparse(I, J, K) (sparse matrix from triplet) in a Fortran mex file? Any disadvantages of saddle valve for appliance water line? Extract drawline coordinates in App designer. null assignment can have only one non-colon index. We and our partners use cookies to Store and/or access information on a device.We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development.An example of data being processed may be a unique identifier stored in a cookie. A = magic (4) A = 44 16 2 3 13 5 11 10 8 9 7 6 12 4 14 15 1 A (2,:) = [] A = 34 16 2 3 13 9 7 6 12 4 14 15 1 Now you need to specify the columns since M is a 2-D matrix with both rows and columns. Save wifi networks and passwords to recover them after reinstall OS. How to find all edge pixels around one region in binary image? "1:end-2" specified rows from 1 through 2 before the last row. rev2022.12.11.43106. What I need to do is depup the matrix by removing rows where the first set of coordinates (e.g columns 1 and 2 in a row) are swapped with the second set of coordinates. Asking for help, clarification, or responding to other answers. If you have a matrix A and want to delete the 3rd and 9th rows, you can use the command: Theme Copy A ( [3,9],:) = []; 5 Comments Show 4 older comments Arezoo Samiei on 7 Oct 2021 Thank you so much Jan! Why do we use perturbative series if they don't converge? Nevertheless, for large matrices, MATLAB programs may execute faster if the zeros function is used to set aside storage for a matrix whose elements are to be generated one at a time, or a row or column at a time. This is interesting. In general, I need to remove rows that contain a specific elements in a specific column, without using a loop. Other MathWorks country x = numpy.delete (x, (0), axis=0) Add Own solution. So it is faster to "make a new matrix" than to "resize an existing matrix," it seems. Reload the page to see its updated state. A = new_matrix. You may receive emails, depending on your. axis square makes the current axes region square (or cubed when three-dimensional) Much space between y-axis and ylabel 2 Responses to move x-axis label to top of figure in matplotlib What I added was to move the Axis label linspace(0, 10, 30) y = np The last line makes the y-axis have integer-only labels The last line makes the y-axis have. . your location, we recommend that you select: . In my code, I will be deleting rows many hundreds of thousands of times. Result should look like that: and as @yoda said, to remove the rows do: Firstly your problem is that entering a matrix inside a matrix means use the values of the matrix as indices. something like: A = new_matrix new_matrix is generated out of A by taking only the rows you want. Your way is much faster: "Elapsed time is 0.000032 seconds. 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