However, instead of copying the content into a string ( which might be HUGE for several files ), try using the flag 'a' (append) instead of 'w' (write, will start at the beginning of the file again) when opening the file, i.e. 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 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. Reload the page to see its updated state. Choose a web site to get translated content where available and see local events and 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. My code is above. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. Unable to complete the action because of changes made to the page. https://www.mathworks.com/matlabcentral/answers/332219-extracting-rows-of-a-matrix, https://www.mathworks.com/matlabcentral/answers/332219-extracting-rows-of-a-matrix#answer_260597, https://www.mathworks.com/matlabcentral/answers/332219-extracting-rows-of-a-matrix#comment_440714, https://www.mathworks.com/matlabcentral/answers/332219-extracting-rows-of-a-matrix#comment_440718, https://www.mathworks.com/matlabcentral/answers/332219-extracting-rows-of-a-matrix#comment_440723, https://www.mathworks.com/matlabcentral/answers/332219-extracting-rows-of-a-matrix#comment_440731, https://www.mathworks.com/matlabcentral/answers/332219-extracting-rows-of-a-matrix#answer_260598, https://www.mathworks.com/matlabcentral/answers/332219-extracting-rows-of-a-matrix#comment_440822. That is. Find centralized, trusted content and collaborate around the technologies you use most. . a (x) doesn't work. Accelerating the pace of engineering and science, MathWorks es el lder en el desarrollo de software de clculo matemtico para ingenieros, 6 7 8 Find the treasures in MATLAB Central and discover how the community can help you! Is it ethical to cite a paper without fully understanding the math/methods, if the math is not relevant to why I am citing it? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Reload the page to see its updated state. Find the treasures in MATLAB Central and discover how the community can help you! offers. Kindly ask help in clear data using indexing or other different methods. Kindly ask help in clear data using indexing or other different methods. 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 What I have known so far is to open the file, textscan those data into 40 different cells, and close the file. Then, to avoid misunderstanding, let's use a simple example. -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. Thanks, Alberto Best Answer Hello, Here is an solution that you can refer, 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. 0 1 2 Theme Copy Or click on any cell in the row and then press Shift + Space. -1.0791 -2.5351 -0.7354 You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. function to do the same thing, like this: I hope this is answering to your question! Select one or more rows and columns Or click on any cell in the column and then press Ctrl + Space. Thank you sooooooo much. Learn more about array, indexing, data, function, matrix array, clear MATLAB Can you post your code so far (or at least the relevant portion of it)? Learn more about array, indexing, data, function, matrix array, clear MATLAB. MathWorks est le leader mondial des logiciels de calcul mathmatique pour les ingnieurs et les scientifiques. 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 . Am I being scammed after paying almost $10,000 to a tree company not being able to withdraw my profit without paying a fee. We have to guess what the questioner asks. Other MathWorks country To extract any row from a matrix, use the colon operator in the second index position of your matrix. 9 5 0, Hello everyone! undermine character creation; cv2 resize keep aspect ratio Thank you again. 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. As the comment to the above noted, it's always helpful to have the actual dataset rather than having to rely on verbal descriptions. -0.3533 -0.4565 -1.5120 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. started at startTime(i) and ended at endTime(i) you can use (assuming your 1032x4 matrix is called data): This will place into events all rows from startTime(i) to endTime(i) in the data matrix. Does Cast a Spell make you a spellcaster? 8 3 2 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 []. Accelerating the pace of engineering and science, MathWorks es el lder en el desarrollo de software de clculo matemtico para ingenieros, 6 7 8 46 views (last 30 days) Orazio Alberto Terracciano on 3 Jul 2019 0 Translate Commented: Orazio Alberto Terracciano on 3 Jul 2019 Accepted Answer: infinity HP1_ordered.txt % Parameter: FileName = 'C:\HP1.txt'; Key = ' MODE '; NewFile = 'C:\HP1_ordered.txt'; 9 5 0, Hello everyone! My code is above. Also, you want to skip 10 rows of the "FileName". 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. ). if you find these lines useful would you please mark my answer as Accepted Answer? Drift correction for sensor readings using a high-pass filter. Choose a web site to get translated content where available and see local events and rev2023.3.1.43269. 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. Someone spent time reading your question, understanding your issue, figuring out the solution, and writing an answer. MathWorks is the leading developer of mathematical computing software for engineers and scientists. Thank you sooooooo much. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. I want a resulting matrix z to have just rows 2 and 4 (the values in Y) of X. Accepted Answer Kindly ask help in clear data using indexing or other different methods. 3 1 2 For example, to get the events recorded at i (e.g. Other MathWorks country D = B(all(C,2),:) . Accelerating the pace of engineering and science. -1.2107 1.7495 -1.6239 Thank you again, You may receive emails, depending on your. Editing away your question is very rude. 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. Theme Copy output = [A {1} (r), A {2} (r), A {3} (r)]; % 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. If the original matrix has the dimension [8 x 5] and A M wants to extract 4 rows, how could the result be a [1 x 44] vector? 1.8556 -0.3747 -0.2835 You may receive emails, depending on your. With the programme I have now I can find the time at which a certain event is happening (I did that though structures). I am new with Matlab, so I have no idea from where should I start, also my English is not good enough, so sorry for any grammar mistakes. offers. Also the \":\" operator in MATLAB means all/everything. Accelerating the pace of engineering and science, MathWorks, 6 7 8 And you can specify groups within table variables, to perform calculations on those groups. Using the assignment operator =, assign the vector to a variable name. 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. No worries. Why did the Soviets not shoot down US spy satellites during the Cold War. Please help me, I think I dont have enough knowledge to do it, but I have to do it. Reload the page to see its updated state. This example code will perform task you specified. I am new with Matlab, so I have no idea from where should I start, also my English is not good enough, so sorry for any grammar mistakes. https://it.mathworks.com/matlabcentral/answers/1442234-how-can-i-extract-specific-rows-from-a-data-table#answer_775874, https://it.mathworks.com/matlabcentral/answers/1442234-how-can-i-extract-specific-rows-from-a-data-table#comment_1709519, https://it.mathworks.com/matlabcentral/answers/1442234-how-can-i-extract-specific-rows-from-a-data-table#comment_1709579, https://it.mathworks.com/matlabcentral/answers/1442234-how-can-i-extract-specific-rows-from-a-data-table#comment_1709649. Similarly, A(:,2) means for all rows, we'd want the second column. 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). Could very old employee stock options still be accessible and viable? To any other reader, if you find this answer of any help, please click on the thumbs-up vote link. Can you help me? Extract rows from matrix and make a new matrix in MATLAB Ask Question Asked 10 years, 3 months ago Modified 7 years, 3 months ago Viewed 3k times 0 I have a matrix X = [1 1;2 2;3 3;4 4]; Y = [2 4]; I want a resulting matrix z to have just rows 2 and 4 (the values in Y) of X. 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. Connect and share knowledge within a single location that is structured and easy to search. 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. I needed to understand what you want. Editing away your question is very rude. Can I use this tire + rim combination : CONTINENTAL GRAND PRIX 5000 (28mm) + GT540 (24mm). That is, Z = [2 2;4 4]; Any solutions? Choose a web site to get translated content where available and see local events and For example, to extract the first two rows from the range A4:D8 and the last two rows from the range A12:D16, use this formula: =CHOOSEROWS (VSTACK (A4:D8, A12:D16), 1, 2, -2, -1) 3 1 2 How can I index a MATLAB array returned by a function without first assigning it to a local variable? To learn more, see our tips on writing great answers. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. % 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). sites are not optimized for visits from your location. -Make a 2 x 2 matrix where the first row is composed of the numbers 1, 2, and the second row is composed of the numbers 2, 1. Based on your location, we recommend that you select: . A more reliable implementation would be: Theme Selecting specific rows of a matrix in Matlab. Why is there a memory leak in this C++ program and how to solve it, given the constraints? 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. . How can I change a sentence based upon input to a command? % extract only those rows which all elements satisfy criteria. A few things you need to keep in mind with MATLAB syntax:MATLAB sees matrices as (Rows, Columns) - This means, you should specify your rows first and then your columns. . offers. Would the reflected sun's radiation melt ice in LEO? . Like all those rows whose first value is greater than 99 and less than 140, i.e. ). Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Change color of a paragraph containing aligned equations. My code is above. Find the treasures in MATLAB Central and discover how the community can help you! 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. 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". Select the row number to select the entire row. Accelerating the pace of engineering and science. Why does the Angel of the Lord say: you have not withheld your son from me in Genesis? Find the treasures in MATLAB Central and discover how the community can help you! Find the treasures in MATLAB Central and discover how the community can help you! The first 2 columns are latitude and longitude and next columns contain various data fields like CO2 etc. 9 5 0, Hello everyone! I am so grateful for your help and explanation, no words. Other MathWorks country Why does Jesus turn to the Father to forgive in Luke 23:34? Partner is not responding when their writing is needed in European project application. Find the treasures in MATLAB Central and discover how the community can help you! Other MathWorks country Why do we kill some animals but not others? Not the answer you're looking for? returns a new table. 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)). but A{2}(4) give me only second element of first column. I have a series of datasets each one about 1032 x 4. But is there any way to do that automatically? Thank you again, You may receive emails, depending on your. You can use startTime and endTime as indices combined with the colon operator (:). 0.5873 -0.5978 -1.3833 Learn more about array, indexing, data, function, matrix array, clear MATLAB. Fgetl, textscan, and the file position indicator, How to adjust and save a .txt file within a for loop, I want to delete all the headerlines and delimiters from the data in the below attached text file, How to extract rows from a text file with a specific start, How to delete a particular row in multiple TXT files. How can I explain to my manager that a project he wishes to undertake cannot be performed by the team? How I can extract specific data . 8 3 2 sites are not optimized for visits from your location. How to get first N number of elements from an array, Matlab 3D scatter plot - extract section of data. I really dont know how to do it. How did Dominion legally obtain text messages from Fox News hosts? Unable to complete the action because of changes made to the page.