or 1-D (1-by-N or N-by-1) ? Not the answer you're looking for? 9 5 0, Hello everyone! Kindly ask help in clear data using indexing or other different methods. Thank you sooooooo much. And you can specify groups within table variables, to perform calculations on those groups. I am so grateful for your help and explanation, no words. Other MathWorks country To make a row vector v with the values (1,2,3,5,11,7,13), do the following: To enclose the vector's elements, use square brackets []. For instance A(2,:) means for the second row, we'd want all columns. Does Cast a Spell make you a spellcaster? Accelerating the pace of engineering and science, MathWorks es el lder en el desarrollo de software de clculo matemtico para ingenieros, 6 7 8 MathWorks is the leading developer of mathematical computing software for engineers and scientists. Someone spent time reading your question, understanding your issue, figuring out the solution, and writing an answer. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. but A{2}(4) give me only second element of first column. I want a resulting matrix z to have just rows 2 and 4 (the values in Y) of X. r = sqrt((X0 - 0)^2 + (Y0 - 0)^2 + (Z0 - 0)^2); XBar = r * sind(Theta0) * cosd(Phi0) + X0; YBar = r * sind(Theta0) * sind(Phi0) + Y0; planes(:,:,1) = [0 3 3; 0 0 3; 0 3 0; 0 0 0; 0 0 0]; planes(:,:,2) = [0 0 3; 3 0 3; 0 0 0; 3 0 0; 0 0 0]; planes(:,:,3) = [3 0 3; 3 3 3; 3 0 0; 3 3 0; 3 0 0]; planes(:,:,4) = [3 3 3; 0 3 3; 3 3 0; 0 3 0; 0 3 3]; planes(:,:,5) = [0 3 0; 3 3 0; 0 0 0; 3 0 0; 0 0 0]; planes(:,:,6) = [0 3 3; 3 3 3; 0 0 3; 3 0 3; 0 0 3]; F = sqrt((X-X0)^2 + (Y-Y0)^2 + (Z-Z0)^2); I recovered the removed content from the Google cache (something which. Also, you want to skip 10 rows of the "FileName". Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. https://it.mathworks.com/matlabcentral/answers/1442234-how-can-i-extract-specific-rows-from-a-data-table, https://it.mathworks.com/matlabcentral/answers/1442234-how-can-i-extract-specific-rows-from-a-data-table#comment_1709369, https://it.mathworks.com/matlabcentral/answers/1442234-how-can-i-extract-specific-rows-from-a-data-table#comment_1709709. Much much appreciate )))) Now it works and I am feel really happy that something works. . My code is above. Choose a web site to get translated content where available and see local events and 1.8556 -0.3747 -0.2835 How do I select certain rows? Can you post your code so far (or at least the relevant portion of it)? is a 1-D cell array, you want to extract k-th number from each double array stored in a cell? To select non-adjacent rows or columns, hold Ctrl and select the row or column numbers. offers. Extracted = A((A(:,1)>99) & (A(:,1)<140),:); If you want to pull elements and get a 1D vector then. Answers (1) Voss on 13 Dec 2022 Ran in: input.txt Theme Copy M = readmatrix ('input.txt'); M (:,end) = []; [~,~,jj] = unique (M,'rows','stable'); M ( [false; diff (jj) == 0],:) = []; writematrix (M,'output.txt','delimiter','\t'); % check the output file: type output.txt 1 2 3 5 6 8 2 4 6 8 9 6 3 5 6 8 9 10 2 4 6 8 9 6 7 8 9 10 22 6 8 7 9 6 2 5 With the programme I have now I can find the time at which a certain event is happening (I did that though structures). Applications of super-mathematics to non-super mathematics. Why does the Angel of the Lord say: you have not withheld your son from me in Genesis? Learn more about column, specific, row, line, excel, extract . 3 1 2 How I can extract specific data . Other MathWorks country But if A is large array, such as 1-by-10000, it's impossible to use the above solution. Using the assignment operator =, assign the vector to a variable name. -Extract the first three numbers of your row vector. Can I use a loop and how? MATLAB - extracting rows of a matrix Ask Question Asked 11 years, 5 months ago Modified 8 years ago Viewed 63k times 11 a = [1 2; 3 4; 5 6] I want to extract the first and third row of a, so I have x = [1; 3] (indices of rows). % Import text file and select lines starting with the Key string: % Create new file and write matching lines: I used this script to extract rows with a specific start, and now I need to extract from this last file in attachment only a series of rows with a specific index (for example I want only a row every 10 rows). Find the treasures in MATLAB Central and discover how the community can help you! ). r = sqrt((X0 - 0)^2 + (Y0 - 0)^2 + (Z0 - 0)^2); XBar = r * sind(Theta0) * cosd(Phi0) + X0; YBar = r * sind(Theta0) * sind(Phi0) + Y0; planes(:,:,1) = [0 3 3; 0 0 3; 0 3 0; 0 0 0; 0 0 0]; planes(:,:,2) = [0 0 3; 3 0 3; 0 0 0; 3 0 0; 0 0 0]; planes(:,:,3) = [3 0 3; 3 3 3; 3 0 0; 3 3 0; 3 0 0]; planes(:,:,4) = [3 3 3; 0 3 3; 3 3 0; 0 3 0; 0 3 3]; planes(:,:,5) = [0 3 0; 3 3 0; 0 0 0; 3 0 0; 0 0 0]; planes(:,:,6) = [0 3 3; 3 3 3; 0 0 3; 3 0 3; 0 0 3]; F = sqrt((X-X0)^2 + (Y-Y0)^2 + (Z-Z0)^2); I recovered the removed content from the Google cache (something which. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, Extract rows from matrix and make a new matrix in MATLAB, The open-source game engine youve been waiting for: Godot (Ep. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. To extract any row from a matrix, use the colon operator in the second index position of your matrix. 9 5 0, Hello everyone! Please help me, I think I dont have enough knowledge to do it, but I have to do it. . Find the treasures in MATLAB Central and discover how the community can help you! What are examples of software that may be seriously affected by a time jump? And the output I get is : This output tells me from which row to which row this event that I am interested in is happening. Or click on any cell in the row and then press Shift + Space. 9 5 0, Hello everyone! Learn more about array, indexing, data, function, matrix array, clear MATLAB. Now you repay that kindness by ensuring that the next person with a similar question can't benefit from this answer. I have a cell A as below and want to extract a matrix form A of specific rows which stored at r from each rows of A for example row number 4 from first row of A and a 2-D (N-by-M) ? Like all those rows whose first value is greater than 99 and less than 140, i.e. if you find these lines useful would you please mark my answer as Accepted Answer? Appreciate any help, At the end I got this data and I need to write function or code which will take exactly data where the last three column in one row will be >=0 and <=3. I assume the below should work. opts = detectImportOptions ('Z_EnergySequence.dat'); data = readtable ('Z_EnergySequence.dat', opts); filtereddata = data (data.X == -4.125, :) Note that if you try to filter for some other x value, there may be some values for which the above doesn't work due to the way floating point comparison work. Appreciate any help, At the end I got this data and I need to write function or code which will take exactly data where the last three column in one row will be >=0 and <=3. How I can extract specific data. This example code will perform task you specified. Not the answer you're looking for? Reload the page to see its updated state. A more reliable implementation would be: Theme so the result has to be 20 answers of distance. Connect and share knowledge within a single location that is structured and easy to search. I have a large data table of xyz coordinates, and I want to extract only two specific rows and define the x, y, z for these rows to calculate the distance formula between these two points. I need to use indexing but dont know how. sites are not optimized for visits from your location. Hope this is making sense for everyone. Find the treasures in MATLAB Central and discover how the community can help you! https://fr.mathworks.com/matlabcentral/answers/1919500-hi-how-i-can-extract-specific-data, https://fr.mathworks.com/matlabcentral/answers/1919500-hi-how-i-can-extract-specific-data#comment_2638075, https://fr.mathworks.com/matlabcentral/answers/1919500-hi-how-i-can-extract-specific-data#answer_1180630, https://fr.mathworks.com/matlabcentral/answers/1919500-hi-how-i-can-extract-specific-data#comment_2635355. Based on your location, we recommend that you select: . Matlab - How to select specific rows based upon column attribute values in matlab? OK. Then, to avoid misunderstanding, let's use a simple example. offers. We have to guess what the questioner asks. 0 1 2 You can do things like this in matlab: Theme data_oi = data (data (:,1)==1|data (:,1)==2,:); This wouild give you your data of interest in a variable data_oi where the elements in the first column is either a 1 or a 2. What's the difference between a power rail and a signal line? Matlab- Merge two matrix with different size? Find centralized, trusted content and collaborate around the technologies you use most. Select one or more rows and columns Or click on any cell in the column and then press Ctrl + Space. Other MathWorks country To any other reader, if you find this answer of any help, please click on the thumbs-up vote link. D = B(all(C,2),:) . Now you repay that kindness by ensuring that the next person with a similar question can't benefit from this answer. Much much appreciate )))) Now it works and I am feel really happy that something works. Accelerating the pace of engineering and science, MathWorks es el lder en el desarrollo de software de clculo matemtico para ingenieros, 6 7 8 In case you are looking for a way to extract a couple of matrix elements whose indices are given by a matrix "idx" and collect those elements in a vector, the following two methods should help. My code is above. Removing rows and columns from MATLAB matrix quickly. Previous question Next question Find the treasures in MATLAB Central and discover how the community . Unable to complete the action because of changes made to the page. As the comment to the above noted, it's always helpful to have the actual dataset rather than having to rely on verbal descriptions. Thank you sooooooo much. You may receive emails, depending on your. 6 7 8 I really dont know how to do it. 8 3 2 Based on your location, we recommend that you select: . Based on your location, we recommend that you select: . Then, to avoid misunderstanding, let's use a simple example. To get specific rows from two or more non-contiguous ranges, you first combine them using the VSTACK function, and then pass the merged range to CHOOSEROWS. offers. 0 Comments Sign in to comment. sites are not optimized for visits from your location. How I can extract specific data . Why did the Soviets not shoot down US spy satellites during the Cold War. Find the treasures in MATLAB Central and discover how the community can help you! ). Kindly ask help in clear data using indexing or other different methods. It's nice to meet you. Choose a web site to get translated content where available and see local events and How did Dominion legally obtain text messages from Fox News hosts? offers. I can do that manually by typing time(1), time(5), time(84), time(90) so I can calculate the duration of the events. Any other idea?? Accelerating the pace of engineering and science. variable, not a double array. A = 90.6848 72.5836 54.4646 36.3276 18.1728, 99.7018 79.8089 59.8924 39.9521 19.9880, 110.7026 88.6271 66.5192 44.3788 22.2058, 124.4195 99.6278 74.7902 49.9066 24.9766, 141.9931 113.7314 85.4017 57.0036 28.5365, 165.3005 132.4561 99.5049 66.4459 33.2780, 197.6559 158.4928 119.1482 79.6196 39.9045, 245.4805 197.0868 148.3494 99.2610 49.8139. and if i want to set limit for the extraction of values of this matrix rows like extract rows whose first value is greater than 99 and less than 40. 3 1 2 Tables are convenient containers for column-oriented data. matlab indexing Share Follow edited Nov 1, 2013 at 14:58 fedorqui 267k 102 538 589 0 1 2 Kindly ask help in clear data using indexing or other different methods. Logical or direct indexing -- without some idea what rule you want to use to define the specific rows of interest, it's hard to know. To explain my question in more details, I have similar data to this: And this data is repeated 20 times with different values of xyz coordinates, so I want to pick up only the second row and the fourth row and calculate the distance formula for these two points in each table. rows 2, 3 and 4. 9 5 0, Hello everyone! Expert Answer 1st step All steps Answer only Step 1/5 1. https://la.mathworks.com/matlabcentral/answers/1919500-hi-how-i-can-extract-specific-data, https://la.mathworks.com/matlabcentral/answers/1919500-hi-how-i-can-extract-specific-data#comment_2638075, https://la.mathworks.com/matlabcentral/answers/1919500-hi-how-i-can-extract-specific-data#answer_1180630, https://la.mathworks.com/matlabcentral/answers/1919500-hi-how-i-can-extract-specific-data#comment_2635355. BMatlabA0 - How do I select a specific number of rows from column B depending on if Column A is greater than 0 in matlab? like limits of latitude are 20 to 30 and limits of longitude are 40 to 50. Accelerating the pace of engineering and science. Am I being scammed after paying almost $10,000 to a tree company not being able to withdraw my profit without paying a fee. How can I change a sentence based upon input to a command? Hi! Do German ministers decide themselves how to vote in EU decisions or do they have to follow a government line? 8 3 2 Someone spent time reading your question, understanding your issue, figuring out the solution, and writing an answer. Say, A is a 1-by-3 cell array and r = 4, as follows: Theme Copy A = {rand (90,1), rand (101,1), rand (100,1)}; r = 4; If you write [A {1} (r), A {2} (r), A {3} (r)], then you can extract the 4th element of each cell. How to extract the first 4 rows of this Matrix. You can access specific rows and columns of a Matlab table using or {} indexing. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. a (x) doesn't work. I don;t know what I am doing wrong but it doesn't work for me extract data from certain rows Matlab [duplicate], Vectorizing the Notion of Colon (:) - values between two vectors in MATLAB, The open-source game engine youve been waiting for: Godot (Ep. Thank you again, You may receive emails, depending on your. What I have known so far is to open the file, textscan those data into 40 different cells, and close the file. How can I explain to my manager that a project he wishes to undertake cannot be performed by the team? Now you repay that kindness by ensuring that the next person with a similar question can't benefit from this answer. -1.2107 1.7495 -1.6239 Help please !! 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. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. Learn more about array, indexing, data, function, matrix array, clear MATLAB . How can I explain to my manager that a project he wishes to undertake cannot be performed by the team? Selecting specific rows of a matrix in Matlab. sites are not optimized for visits from your location. For example, to get the events recorded at i (e.g. Similarly, A(:,2) means for all rows, we'd want the second column. How I can extract specific data . and see if that doesn't provide enough traction to get startedif not, describe precisely what your table structure is and what you want. Do you want to show him how to do it for a table variable? My code is above. Thank you again, You may receive emails, depending on your. In this code, it is supposed that you have "FileName" and want to write its containts into "NewFile". Reload the page to see its updated state. Unable to complete the action because of changes made to the page. https://www.mathworks.com/matlabcentral/answers/501927-extract-specific-rows-of-a-cell, https://www.mathworks.com/matlabcentral/answers/501927-extract-specific-rows-of-a-cell#comment_789876, https://www.mathworks.com/matlabcentral/answers/501927-extract-specific-rows-of-a-cell#comment_789878, https://www.mathworks.com/matlabcentral/answers/501927-extract-specific-rows-of-a-cell#answer_411976. 0 1 2 No worries. For more on basic indexing, see: Other MathWorks country Could very old employee stock options still be accessible and viable? Hello everyone! Based on your location, we recommend that you select: . 0 1 2 Would the reflected sun's radiation melt ice in LEO? Editing away your question is very rude. Does Cast a Spell make you a spellcaster? MathWorks is the leading developer of mathematical computing software for engineers and scientists. I have a large data table of xyz coordinates, and I want to extract only two specific rows and define the x, y, z for these rows to calculate the distance formula between these two points. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. I really dont know how to do it. That is, Z = [2 2;4 4]; Any solutions? -1.0791 -2.5351 -0.7354 Why do we kill some animals but not others? Otherwise you would have to come back and specify more detailed what kind of result you are expecting. This example code will perform task you specified. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. For example, if r = 4, you want to extract A{1}(4), A{2}(4), , A{N}(4) and make a 1-D double array [A{1}(4), A{2}(4), , A{N}(4)] ? Editing away your question is very rude. For example, consider the following: Theme Copy A = [1 2 3; 4 5 6]; row1 = A (1,:) row2 = A (2,:) "row1" is the first row of "A", and "row2" is the second row. Unable to complete the action because of changes made to the page. How I can extract specific data . Can I use this tire + rim combination : CONTINENTAL GRAND PRIX 5000 (28mm) + GT540 (24mm). . Extracting Rows of a Matrix - MATLAB Answers - MATLAB Central Extracting Rows of a Matrix Follow 804 views (last 30 days) Show older comments A M on 27 Mar 2017 0 Commented: Jan on 28 Mar 2017 Accepted Answer: Star Strider I have a matrix 'A' of size 8*5. -1.1512 0.7561 0.4465 You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. Other MathWorks country Acceleration without force in rotational motion? Unable to complete the action because of changes made to the page. You may receive emails, depending on your. Why is prior manipulation necessary before using 'Solve'? offers. Accelerating the pace of engineering and science, MathWorks, 6 7 8 returns a new table. I used this script to extract rows with a specific start, and now I need to extract from this last file in attachment only a series of rows with a specific index (for example I want only a row every 10 rows). Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. PS: If the file is not empty in the beginning, but you don't want to keep the old content, you need to open it with "w" for k == 1, and then use "a". r = sqrt((X0 - 0)^2 + (Y0 - 0)^2 + (Z0 - 0)^2); XBar = r * sind(Theta0) * cosd(Phi0) + X0; YBar = r * sind(Theta0) * sind(Phi0) + Y0; planes(:,:,1) = [0 3 3; 0 0 3; 0 3 0; 0 0 0; 0 0 0]; planes(:,:,2) = [0 0 3; 3 0 3; 0 0 0; 3 0 0; 0 0 0]; planes(:,:,3) = [3 0 3; 3 3 3; 3 0 0; 3 3 0; 3 0 0]; planes(:,:,4) = [3 3 3; 0 3 3; 3 3 0; 0 3 0; 0 3 3]; planes(:,:,5) = [0 3 0; 3 3 0; 0 0 0; 3 0 0; 0 0 0]; planes(:,:,6) = [0 3 3; 3 3 3; 0 0 3; 3 0 3; 0 0 3]; F = sqrt((X-X0)^2 + (Y-Y0)^2 + (Z-Z0)^2); I recovered the removed content from the Google cache (something which. Connect and share knowledge within a single location that is structured and easy to search. % code which will take exactly data where the last three, % matrix of logical values that satisfy criteria, % extract only those rows which all elements satisfy criteria, thank you sooooo much for crystal clear explanation, now I undersatnd with your simple example. Please help me, I think I dont have enough knowledge to do it, but I have to do it. writetable (documentation) can write the data back to an excel file. This is a pretty easily researched question in my opinion: the first result for "MATLAB matrix indexing" answers your question and has a lot more general information about selecting parts of MATLAB matrices. I need to use indexing but dont know how. Accelerating the pace of engineering and science. I really dont know how to do it. This example code will perform task you specified. Thank you sooooooo much. Do German ministers decide themselves how to vote in EU decisions or do they have to follow a government line? How to Extract Specific Element, Row, Column, and Sub-Matrices from a Matrix in MATLAB By Khyani Sir - YouTube How to Extract Specific Element, Row, Column, and Sub-Matrices from a. Other MathWorks country % code which will take exactly data where the last three, % matrix of logical values that satisfy criteria, % extract only those rows which all elements satisfy criteria, thank you sooooo much for crystal clear explanation, now I undersatnd with your simple example. This example code will perform task you specified. Sign in to answer this question. Find the treasures in MATLAB Central and discover how the community can help you! How to extract specific column and row and put. To learn more, see our tips on writing great answers. Can you help me? Editing away your question is very rude. Sorry for the confusion. Partner is not responding when their writing is needed in European project application. Much much appreciate )))) Now it works and I am feel really happy that something works. Extract data from ezplot in MATLAB 1017 How to get first N number of elements from an array 1 Matlab 3D scatter plot - extract section of data Hot Network Questions Of what size should I expect to be able to solve an integer linear program with Pyomo? . How to approach that? https://la.mathworks.com/matlabcentral/answers/1919500-hi-how-i-can-extract-specific-data, https://la.mathworks.com/matlabcentral/answers/1919500-hi-how-i-can-extract-specific-data#comment_2638075, https://la.mathworks.com/matlabcentral/answers/1919500-hi-how-i-can-extract-specific-data#answer_1180630, https://la.mathworks.com/matlabcentral/answers/1919500-hi-how-i-can-extract-specific-data#comment_2635355. Your "1:end" means "1:numel(A)" here and is not useful. sites are not optimized for visits from your location. 0.3756 -1.4333 -1.3172, Navigazione principale in modalit Toggle. sites are not optimized for visits from your location. This way, you can read the files one at a time, and write the content to a single file. I needed to understand what you want. Learn more about array, indexing, data, function, matrix array, clear MATLAB Kindly ask help in clear data using indexing or other different methods. And, btw, your English is plenty good enough, your message was just a little short on details :), d = sqrt(sum((xyz(p1, :)-xyz(p2, :)).^2)). https://jp.mathworks.com/matlabcentral/answers/1919500-hi-how-i-can-extract-specific-data, https://jp.mathworks.com/matlabcentral/answers/1919500-hi-how-i-can-extract-specific-data#comment_2638075, https://jp.mathworks.com/matlabcentral/answers/1919500-hi-how-i-can-extract-specific-data#answer_1180630, https://jp.mathworks.com/matlabcentral/answers/1919500-hi-how-i-can-extract-specific-data#comment_2635355.
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