9 5 0, Hello everyone! Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. 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 . I need to use indexing but dont know how. sites are not optimized for visits from your location. ). I have a series of datasets each one about 1032 x 4. 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. 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. 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)). Thank you again. offers. ). 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. Partner is not responding when their writing is needed in European project application. Unable to complete the action because of changes made to the page. This way, you can read the files one at a time, and write the content to a single file. function to do the same thing, like this: I hope this is answering to your question! Find the treasures in MATLAB Central and discover how the community can help you! Thank you sooooooo much. To any other reader, if you find this answer of any help, please click on the thumbs-up vote link. I can do that manually by typing time(1), time(5), time(84), time(90) so I can calculate the duration of the events. Thank you sooooooo much. 8 3 2 ). close the file after the loop. To learn more, see our tips on writing great answers. Making statements based on opinion; back them up with references or personal experience. Connect and share knowledge within a single location that is structured and easy to search. Or click on any cell in the row and then press Shift + Space. This example code will perform task you specified. 3 1 2 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) Otherwise you would have to come back and specify more detailed what kind of result you are expecting. How to extract specific rows from a text file? No worries. 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. 0.5873 -0.5978 -1.3833 Similarly, A(:,2) means for all rows, we'd want the second column. Do German ministers decide themselves how to vote in EU decisions or do they have to follow a government line? For instance A(2,:) means for the second row, we'd want all columns. Much much appreciate )))) Now it works and I am feel really happy that something works. 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. OK. Then, to avoid misunderstanding, let's use a simple example. 9 5 0, Hello everyone! 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. Why do we kill some animals but not others? 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. But is there any way to do that automatically? 3 1 2 0 Comments Sign in to comment. % extract only those rows which all elements satisfy criteria. That is, Z = [2 2;4 4]; Any solutions? % 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. offers. 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. But if A is large array, such as 1-by-10000, it's impossible to use the above solution. Other MathWorks country MathWorks is the leading developer of mathematical computing software for engineers and scientists. Select one or more rows and columns Or click on any cell in the column and then press Ctrl + Space. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. like limits of latitude are 20 to 30 and limits of longitude are 40 to 50. Now you repay that kindness by ensuring that the next person with a similar question can't benefit from this answer. Removing rows and columns from MATLAB matrix quickly. Thanks, Alberto Best Answer Hello, Here is an solution that you can refer, Find centralized, trusted content and collaborate around the technologies you use most. sites are not optimized for visits from your location. 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. Now you repay that kindness by ensuring that the next person with a similar question can't benefit from this answer. sites are not optimized for visits from your location. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. returns a new table. MathWorks is the leading developer of mathematical computing software for engineers and scientists. Now you repay that kindness by ensuring that the next person with a similar question can't benefit from this answer. % extract only those rows which all elements satisfy criteria. sites are not optimized for visits from your location. Find the treasures in MATLAB Central and discover how the community can help you! Why did the Soviets not shoot down US spy satellites during the Cold War. With the programme I have now I can find the time at which a certain event is happening (I did that though structures). D = B(all(C,2),:) . 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. Unable to complete the action because of changes made to the page. Asking for help, clarification, or responding to other answers. 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. Thank you sooooooo much. . And you can specify groups within table variables, to perform calculations on those groups. 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? Expert Answer 1st step All steps Answer only Step 1/5 1. offers. Previous question Next question is a 1-D cell array, you want to extract k-th number from each double array stored in a cell? Very often, the table, array and matrix are misused in question. Find the treasures in MATLAB Central and discover how the community can help you! 9 5 0, Hello everyone! 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. My code is above. Also the \":\" operator in MATLAB means all/everything. 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. Please help me, I think I dont have enough knowledge to do it, but I have to do it. Using the assignment operator =, assign the vector to a variable name. 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. 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. How can I index a MATLAB array returned by a function without first assigning it to a local variable? Kindly ask help in clear data using indexing or other different methods. Drift correction for sensor readings using a high-pass filter. Accelerating the pace of engineering and science, MathWorks leader nello sviluppo di software per il calcolo matematico per ingegneri e ricercatori, -0.7146 0.5304 -1.1481 % 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. I really dont know how to do it. Choose a web site to get translated content where available and see local events and Based on your location, we recommend that you select: . Accelerating the pace of engineering and science. variable, not a double array. Kindly ask help in clear data using indexing or other different methods. For example, to get the events recorded at i (e.g. Rename .gz files according to names in separate txt-file. How can I change a sentence based upon input to a command? 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. Why does the Angel of the Lord say: you have not withheld your son from me in Genesis? Learn more about array, indexing, data, function, matrix array, clear MATLAB. Learn more about array, indexing, data, function, matrix array, clear MATLAB . rev2023.3.1.43269. Learn more about column, specific, row, line, excel, extract . what should I do to select the data that lies between particular latitude and longitudes. I am so grateful for your help and explanation, no words. My code is above. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Unable to complete the action because of changes made to the page. In this video I'll go over how to extract an entire row or column using MATLAB. 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. 3 1 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 []. I am so grateful for your help and explanation, no words. Thank you again, You may receive emails, depending on your. Accelerating the pace of engineering and science. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Editing away your question is very rude. -1.2107 1.7495 -1.6239 Please help me, I think I dont have enough knowledge to do it, but I have to do it. 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. Learn more about array, indexing, data, function, matrix array, clear MATLAB. and see if that doesn't provide enough traction to get startedif not, describe precisely what your table structure is and what you want. Reload the page to see its updated state. . -1.1512 0.7561 0.4465 Theme Copy output = [A {1} (r), A {2} (r), A {3} (r)]; How to extract the first 4 rows of this Matrix. To extract any row from a matrix, use the colon operator in the second index position of your matrix. matlab indexing Share Follow edited Nov 1, 2013 at 14:58 fedorqui 267k 102 538 589 Use spaces to separate the elements. Can you help me? How I can extract specific data . Would the reflected sun's radiation melt ice in LEO? 8 3 2 Please help me, I think I dont have enough knowledge to do it, but I have to do it. Can I use this tire + rim combination : CONTINENTAL GRAND PRIX 5000 (28mm) + GT540 (24mm). D = B(all(C,2),:) D = 23. Someone spent time reading your question, understanding your issue, figuring out the solution, and writing an answer. Theme Copy offers. 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.

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