No worries. For example, suppose you want to extract the (2,1), (3,2), and (4,4) elements from A. V = randi (1000,1,100) % fake data. Share Including these techniques and related functions in your MATLAB programming repertoire expands your ability to create masterful, readable, and vectorized code. your location, we recommend that you select: . 2 Adaptive Wideband Beamforming 19 Multi-beamforming based on spatial projections using a fast Fourier transform (FFT) that supports . This doesn't completely answer the question. matlab extract multiple values from matrix. How to extract the first 4 rows of this Matrix. If you see the "cross", you're on the right track, Allow non-GPL plugins in a GPL main program. subplot(m,n,p) This command splits the figure into a matrix of m rows and n columns, thereby creating m*n plots on one figure. If you go for the MATLAB help files, it will be a few hours that are. Yes i mean column for typing reasons i wrote it horizontally. 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. Appealing a verdict due to the lawyers being incompetent and or failing to follow instructions? The expression A(A > 5) is equivalent to A(find(A > 5)). Vc27 on 18 Nov 2022 at 13:16. For example, consider the following: row1 is the first row of A, and row2 is the second row. 5 rows and 2 columns)? Share Improve this answer Follow answered Sep 5, 2010 at 11:32 Jonas 74.5k 10 136 177 4 . To extract any row from a matrix, use the colon operator in the second index position of your matrix. Reload the page to see its updated state. @Hello Matlab: Your explanation is inconsistent: "to get the first row to a vector of 1x2" and "assign those two value to [m,n]" means two quite different things. Choose a web site to get translated content where available and see local events and offers. 1 5 4. I'm not exactly sure if I understood your question correctly. Ready to optimize your JavaScript with Rust? Further reading As this seems a basic question to me, it may be useful to have a look at the Getting Started tutorial. For example, suppose you want to temporarily replace NaN values with zeros, perform some computation, and then put the NaN values back in their original locations. How is the merkle root verified if the mempools may be different? offers. MATLAB - extracting rows of a matrix Ask Question Asked 11 years, 3 months ago Modified 7 years, 10 months 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). How to extract a column from cell arrays matrix?. Loop For extract maximum rows of matrix based on. EDIT: on re-reading your question, it seems that perhaps all you are after is just the vector of the first row of. Like all those rows whose first value is greater than 99 and less than 140, i.e. Connect and share knowledge within a single location that is structured and easy to search. Thx in Advance, % the column you want to extract, in this case the 5th. Course Hero uses AI to attempt to automatically extract content from documents to surface to you and others so you can study better, e.g., in search results, to enrich docs, and more. Learn more about matrix array, vector, matrix, vectors MATLAB Learn more about matrix manipulation, row and columns For example, i have a matrix of following away: A=[N N] 0.0198 7.8095 0.0199 7.8213 0.0199 7.8332 0.0199 7.8450 0.0199 7.8569 0.0199 7.8687 0. 1 6 4. How to extract the first 4 rows of this Matrix. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. A matrix is a convenient way to store an array of numbers. sites are not optimized for visits from your location. Is it correct to say "The glue on the back of the sticker is dying down so I can not stick the sticker to the wall"? Of the many possible vectorization techniques, many rely on MATLAB indexing methods, five of which are described in this article. 2 As suggested by rahnema1, you can use Matrix Indexing in matlab as follows: partA = A (1:p, :) or for your specific example: partA = A (1:3, :) Explanation 1:p: selects all rows between 1 and p. : selects all columns. Results will be the elements marked by X: A([2 4], [3 4 5 7]) . date = datetime(2020,1,1):days(1):datetime('now'); . . what i have is a A, where size (A)=(i,12) where i changes as the input changes i want to extract from A a Certain column up to a certain row how i can do this ? I would like to learn the method of circular shift for x or other signals x (n)= {1,2,5,7,0,1};g (n)=x [ (n12)]8;g (n)=x [ (12)]8. matlab extract multiple values from matrix . For example if you have 4x3 matrix, the linear indices of the elements look like this, they are growing by the columns: Because you passed the [1 3] vector as a parameter, the 1st and 3rd elements were selected only. MathWorks is the leading developer of mathematical computing software for engineers and scientists. Choose a web site to get translated content where available and see local events and Using Matlab syntax is the best choice in a Matlab forum. Did you mean that your original matrix is 5x2 matrix (i.e. Or you could replace all the spaces in a string matrix str with underscores. Please helpcan I apply a loop program for it?? Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. This would only work if the matrix had two columns. This is much more informative than the accepted answer. Extract column from matrix - MATLAB Answers - MATLAB Central Extract column from matrix 680 views (last 30 days) Show older comments SuzieChan on 20 Oct 2019 0 Link Translate Edited: Stephan on 20 Oct 2019 SuzieChan accidently destroyed her question, by inserting thank you in this part - here is what she asked: I have a matrix A: Theme Copy A = How to use a VPN to access a Russian website that is banned in the EU? For more on basic indexing, see: , you might find other discussions on this online. I have a matrix of dimension(256, 32), means rows=256 and column=32. A row subset matrix can be extracted from the original matrix using a filter for the selected row names. Can virent/viret mean "green" in an adjectival sense? C R R X X X R X . This preview shows page 1 - 2 out of 2 pages. I'd just like to take it that excel is having user inputs rather than users being inputting values but I'm certain I'm wrong. The expression A([2 3 4], [1 2 4]) won't do what you want. MATLAB provides a function called sub2ind that converts from row and column subscripts to linear indices. Does a 120cc engine burn 120cc of fuel a minute? 1 5 4. sites are not optimized for visits from your location. 1 6 4. Usually in MATLAB it makes a lot more sense to keep your data together in arrays, so it may not be necessary to do this multiple-assignment. Which form you use is mostly a matter of style and your sense of the readability of your code, but it also depends on whether or not you need the actual index values for something else in the computation. your location, we recommend that you select: . . -1. From Matrix Indexing in MATLAB: When you index into the matrix A using only one subscript, MATLAB treats A as if its elements were strung out in a long column vector, by going down the columns consecutively I just hope it doesn't look stupid to you anymore (along with the right answers from angainor and Marwan) Share Improve this answer Follow Solve this exercise using Matlab With X = magic(4), perform the following operations: a) Extract the 3rd row of matrix X and store it in vector Y. b) Extract the 2nd and 3rd columns of matrix X and store them in matrix Z. c) Add the 1st and 3rd rows of matrix X together and store the result in vector W d) Change the value in the second row and third column of X to 365 and call the result AA e . How to extract the first 4 rows of this Matrix. Not the answer you're looking for? Loop For extract maximum rows of matrix based on vectors - MATLAB Answers - MATLAB Central Home Ask Answer Browse Software di prova Loop For extract maximum rows of matrix based on vectors Follow 15 views (last 30 days) Show older comments abdullah al-dulaimi 42 minuti ago Answered: Fangjun Jiang 23 minuti ago Accepted Answer: Voss Indexing is a key to the effectiveness of MATLAB at capturing matrix-oriented ideas in understandable computer programs. To use this command, the following line of code is entered into the MATLAB command window or run from an m-file. For example, this matrix: Another regular newsgroup contributor, Brett Shoelson, provided this compact solution. From the diagram you can see that A(14) is the same as A(2,4). Choose a web site to get translated content where available and see local events and rev2022.12.9.43105. No loop required, just use indexing and reshape (and possibly transpose, depending on the order you want). Other MathWorks country General form of 2d matrix indexing: A([list of rows], [list of columns]) The result is the elements in the intersection of the indexed rows and columns. if you find these lines useful would you please mark my answer as Accepted Answer? How to approach that? Why is Singapore considered to be a dictatorial regime and a multi-party democracy at the same time? Based on V = 1100. MVDRBeamformer (Name,Value) creates an MVDR beamformer with each property Name set to a specified Value. This question has also been. Making statements based on opinion; back them up with references or personal experience. I'm new to MATLAB, so explicit instructions would be fantastic. Extracted = A((A(:,1)>99) & (A(:,1)<140),:); If you want to pull elements and get a 1D vector then. Choose multiple values from multiple rows and columns from matrix in matlab; Removing all full 0 rows in an 3d matrix in matlab; Varying sized rows in matrix - matlab; Reshaping a matrix in Matlab by selecting rows at a fixed distance; Assign an entire row to multiple rows of another matrix in matlab; How to extract rows of a matrix with . We'll use a magic square for our experiments: Most often, indexing in matrices is done using two subscriptsone for the rows and one for the columns. Unable to complete the action because of changes made to the page. Do you want to obtain the vector of the first row, corresponding to the elements of the first row of the matrix? So far Hikaru and I have addressed. You should consider this. I have this data , Consist of 3 vectors, i want to create a Loop for 1:5: size (data) , to extract rows that have maximum value for vector 2 (colomn number 2) 1 3 4. Learn more about matrix array, vector, matrix, vectors MATLAB Loop For extract maximum rows of matrix based on vectors Follow 3 views (last 30 days) Show older comments abdullah al-dulaimi 4 minutes ago Vote 0 Link I have this data , Consist of 3 vectors, i want to create a Loop for 1:5: size (data) , to extract rows that have maximum value for vector 2 (colomn number 2) 1 3 4 1 5 4 1 6 4 1 2 4 1 1 4 2 4 4 You can use linear indexing to extract those elements: That's easy to see for this example, but how do you compute linear indices in general? Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content, Cooking roast potatoes with a slow cooked roast. Based on You can combine indexing with assignment to change array values to equal other elements. matlab indexing Share Follow edited Nov 1, 2013 at 14:58 fedorqui 263k 100 531 585 I have this data , Consist of 3 vectors, i want to create a Loop for 1:5: size (data) , to extract rows that have maximum value for vector 2 (colomn number 2) 1 3 4. I have a matrix 'A' of size 8*5. P = 114. How to extract the first 4 rows of this Matrix. For example, this code would change the value of, You may receive emails, depending on your. offers. MathWorks is the leading developer of mathematical computing software for engineers and scientists. Loop For extract maximum rows of matrix based on. circular shift row matrix. Matlab Extract Row From Matrix in Excel. Let's start with the simple case of a vector and a single subscript. To any other reader, if you find this answer of any help, please click on the thumbs-up vote link. 1 2 4. Matlab Extract Row And Column From Matrix Matlab Assignment Help Online, Matlab project and homework Help Matlab Extract Row And Column From Matrix I have How to print and pipe log file at the same time? Where ever zero is there, extract that row. The SAS/IML language supports two ways to extract elements: by using subscripts or by using indices.Use subscripts when you are extracting a rectangular portion of a matrix, such as a row, a column, or a submatrix. Many MATLAB functions that start with is return logical arrays and are very useful for logical indexing. To extract a column of a matrix use M (:,j) where M is the matrix and j the column you want to extract. To extract any row from a matrix, use the colon operator in the second index position of your matrix. In this example, the computation is two-dimensional filtering using filter2. MATLAB provides a function called sub2ind that converts from row and column subscripts to linear indices. You can always, however, use a scalar on the right side: This form of indexed assignment is called scalar expansion. Syntax: matrix [ vec , ] Where, vec contains the row names to be fetched All the columns are retrieved from the data frame. I have a matrix 'A' of size 8*5. As far as I know, there is no inbuilt way to achieve this. For more on basic indexing, see: +1. Also, with your above syntax, I found this answer in this same post more informative: We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. Vectorization means using MATLAB language constructs to eliminate program loops, usually resulting in programs that run faster and are more readable. The second column, however, has a unique value for each row (see example data below). Would salt mines, lakes or flats be reasonably found in high, snowy elevations? I needed to understand what you want. That is, what if k is a vector of length m? To learn more, see our tips on writing great answers. A = rand (200,12) % 200 rows and 12 columns n = 50; % upto 50 rows m = 5; % the column you want to extract, in this case the 5th B = A (1:n,m); You should find all these basics in the getting started guide, I urge you to go through them as it will save you a lot of time: http://www.mathworks.com/help/matlab/learn_matlab/array-indexing.html To extract any row from a matrix, use the colon operator in the second index position of your matrix. I find logical indexing works well for selecting rows to extract. C R R X X X R X Reference and some similar examples: tutorial on MATLAB matrix indexing. If you use a for loop to iterate so many times, how do you acess the first elemeent after the loop is complete? Is there a quick and easy way to do this? To replace all NaN elements of the matrix B with zero, use. This example shows how to extract data from a MATLAB figure. , in which case you do not need to assign to two separate values first, as you can just extract the vector directly: If you just need the row (vector), then there is no need in MATLAB to create intermediate variables, What is the command if I want to have a matrix that has a column of all elements as 273, %our number of elememts is 38. if i wanted to extract a certain column without the first element how would i do that. Thanks, Jon I'll have a look at a little more detail about what newsmean I have a matrix which I'm using in my C# application. I have a matrix 'A' of size 8*5. C C C . 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? https://www.mathworks.com/help/matlab/learn_matlab/array-indexing.html. You do it like this: We hope that the MATLAB indexing variants illustrated in this article give you a feel for ways you can express algorithms compactly and efficiently. Does integrating PDOS give total charge of a system? Stephen23 on 18 Nov 2022 at 12:55. Learn more about read from column in cell arrays matrix Find the treasures in MATLAB Central and discover how the community can help you . I want to select 128 rows of the particular matrix and make another Vector of dimension (1, 256*32) means to represent all the elements in a single row. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. Such engineers, need to extract column 2 of. The comma separates the dimensions, : means "entire range", and square brackets make a list. Basic MATLAB indexing is explained in the introductory tutorials: https://www.mathworks.com/help/matlab/getting-started-with-matlab.html. MathWorks is the leading developer of mathematical computing software for engineers and scientists. However if it really is necessary to do this multiple assignment, then you could: Although the first option is much clearer! By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. I'm trying to extract the first row from my matrix and put in a vector like [m,n]. 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. Find the treasures in MATLAB Central and discover how the community can help you! Other MathWorks country Learn more about matrix, array . Other MathWorks country 211 2 67 947 139 631 401 743 53 181 47 521 449 71. The single subscript can be a vector containing more than one linear index, as in: Consider again the problem of extracting just the (2,1), (3,2), and (4,4) elements of A. Another indexing variation, logical indexing, has proven to be both useful and expressive. 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). I would like to know how I can write a program that can extract 3 matrices according to the value of the first column (see example output). a (x) doesn't work. You can use it to extract the desired elements this way: idx = sub2ind (size (A), [2 3 4], [1 2 4]) ans = 2 7 16 A (idx) ans = 5 7 1 Advanced Examples Using Linear Indexing Example 1: Shifting the Rows of a Matrix Use indices when you want to extract values from a non . . from 41 if there's 50 rows) till the last row (e.g. Extracting Rows of a Matrix. You should find all these basics in the getting started guide, I urge you to go through them as it will save you a lot of time: http://www.mathworks.com/help/matlab/learn_matlab/array-indexing.html, You may receive emails, depending on your. But what if k is a function of the row number? 1 2 4. Then to extract the first row, you simply use: yes but I want to get the first row to a vector of 1x2, and to by [m,n] where the first element in the new vector is m and the second is n how I can assign those two value to [m,n]?? on 6 May 2016 To test if members of a set belong to another set you use ismember, with the 'rows' option in your case: Theme Copy %given: col1set = [0.05, 0.1, 0.2, 0.5]; col2set = [0.05, 0.1, 0.25, 0.5, 1.0, 2.0, 3.0]; %demo data data = [0.05, 0.5, 1, 1; 0.3, 0.05, 2, 2; 0.2, 0.4, 3, 3; 0.1, 0.1, 4, 4; The OP wants all columns indexed by rows 1 and 3, not the individual elements. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. sites are not optimized for visits from your location. rows 2, 3 and 4. Accelerating the pace of engineering and science. Is there a database for german words with their pronunciation? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, If you keep having questions on these types of matrix manipulations, I recommend you check out the MATLAB help, or any of the many free tutorials online. you could write a loop to iterate across the rows of the matrix: Thanks for contributing an answer to Stack Overflow! Since a matrix's elements are accessed in a dual index format, particular row selection can be carried out. If you want to sum the elements of that column, just do sum (M (:,j)) M= [1 1; 0.4401 4; 0 2; 0 3] c1=M (:,1) summation = sum (c1) Share Improve this answer from a numeric vector. Accepted Answer. Other MathWorks country In addition, the mechanics of indexing into each dimension with vectors is not well-known with many MATLAB users. 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, 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. 50), and all columns. In MATLAB if one parameter is given when indexing, it is so-called linear indexing. Theme Copy MATLABhas several indexing styles that are not only powerful and flexible, but also readable and expressive. The rubber protection cover does not pass through the hole in the rim. of these, so if there is something that is not clear, you need to explain it to us again. Please do not invent a new notation and expect, that the readers understand it. However, often you need to extract certain elements from a matrix. 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. How can I do that? Unable to complete the action because of changes made to the page. What if your matrix has more than 2 columns? Matlab Extract Row And Column From Matrix I am getting have a peek hereI need to filter all the rows with my data blocks and it must be Expected their explanationmy data table the rows might contain three columns (col1,col2,col3 and col4 the records and col5) please help me in understanding its relation between row and column. for example, if my column has the values: 2,3,4,5,6 and i want to access all the values in the column after 2 how would i do that? The simplest form just picks out a single element: More generally, one or both of the row and column subscripts can be vectors: A single : in a subscript position is shorthand notation for 1:end and is often used to select entire rows or columns: There is often confusion over how to select scattered elements from a matrix. Now consider indexing into a matrix. How many transistors at minimum do you need to build a general-purpose computer? Here's a smaller approximation of that matrix (with random temperatures every day for 2 years at 1 location): . Reload the page to see its updated state. In logical indexing, you use a single, logical array for the matrix subscript. your location, we recommend that you select: . Accelerating the pace of engineering and science. You may receive emails, depending on your. By Steve Eddins and Loren Shure, MathWorks. . This diagram illustrates how two-subscript indexing works: Extracting scattered elements from a matrix requires a different style of indexing, and that brings us to our next topic. % Create a sample data set. When you index into the matrix A using only one subscript, MATLAB treats A as if its elements were strung out in a long column vector, by going down the columns consecutively, as in: The expression A(14) simply extracts the 14th element of the implicit column vector. Example Data 3, 0.1234 1, 0.1345 1, 0.1456 2, 0.1567 How are you supposed to get 1x2 vector when the first row contains 5 elements? You can use it to extract the desired elements this way: A MATLAB user recently posed this question in the comp.soft-sys.matlab newsgroup: If I want to shift the rows of an m-by-n matrix A by k places, I use A(:,[n-k+1:n 1:n-k]). Logical indexing is closely related to the find function. Sorry for the confusion. If your matrix numbers are integers you dont need to write all the zeros after the dot. Run Sections You can run your code file . For example, A(A > 12) extracts all the elements of A that are greater than 12. because you tried to assign the values to, % extract the first row and assign it to V, % this is essentially V, but if this is what you wanted. Choose a web site to get translated content where available and see local events and For example, you could replace all the NaN elements in an array with another value by using a combination of isnan, logical indexing, and scalar expansion. P = V (isprime (V)) % the prime values. C C C . Accelerating the pace of engineering and science. Why is it so much harder to run on a treadmill when not holding the handlebars? MATLAB Language Fundamentals Matrices and Arrays Creating and Concatenating Matrices. The vector is: Or the subscript can itself be another vector: The colon notation in MATLAB provides an easy way to extract a range of elements from v: Swap the two halves of v to make a new vector: The special end operator is an easy shorthand way to refer to the last element of v: Combine the colon operator and end to achieve a variety of effects, such as extracting every k-th element or flipping the entire vector: By using an indexing expression on the left side of the equal sign, you can replace certain elements of the vector: Usually the number of elements on the right must be the same as the number of elements referred to by the indexing expression on the left. Extracting Rows of a Matrix - MATLAB Answers - MATLAB Central Extracting Rows of a Matrix Follow 1,156 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. Find centralized, trusted content and collaborate around the technologies you use most. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Indexing into a matrix is a means of selecting a subset of elements from the matrix. Tags matrix; array; Community Treasure Hunt. sites are not optimized for visits from your location. Based on Is it cheating if the proctor gives a student the answer key by mistake and the student doesn't report it? The Matlab /Octave script performs the following (a) Generate random binary sequence of +1s and -1s. jumbuck pastoral newsletter. Accelerating the pace of engineering and science. Reload the page to see its updated state. https://www.mathworks.com/matlabcentral/answers/175231-extract-first-row-from-matrix, https://www.mathworks.com/matlabcentral/answers/175231-extract-first-row-from-matrix#answer_166997, https://www.mathworks.com/matlabcentral/answers/175231-extract-first-row-from-matrix#comment_264288, https://www.mathworks.com/matlabcentral/answers/175231-extract-first-row-from-matrix#comment_264296, https://www.mathworks.com/matlabcentral/answers/175231-extract-first-row-from-matrix#comment_264312, https://www.mathworks.com/matlabcentral/answers/175231-extract-first-row-from-matrix#comment_2472363, https://www.mathworks.com/matlabcentral/answers/175231-extract-first-row-from-matrix#answer_349252, https://www.mathworks.com/matlabcentral/answers/175231-extract-first-row-from-matrix#comment_1166148, https://www.mathworks.com/matlabcentral/answers/175231-extract-first-row-from-matrix#answer_167004, https://www.mathworks.com/matlabcentral/answers/175231-extract-first-row-from-matrix#comment_1362421, https://www.mathworks.com/matlabcentral/answers/175231-extract-first-row-from-matrix#answer_319698, https://www.mathworks.com/matlabcentral/answers/175231-extract-first-row-from-matrix#comment_566788, https://www.mathworks.com/matlabcentral/answers/175231-extract-first-row-from-matrix#answer_371020, https://www.mathworks.com/matlabcentral/answers/175231-extract-first-row-from-matrix#comment_695130, https://www.mathworks.com/matlabcentral/answers/175231-extract-first-row-from-matrix#answer_519923, https://www.mathworks.com/matlabcentral/answers/175231-extract-first-row-from-matrix#answer_664279. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Here are the elements of the matrix A along with their linear indices: The linear index of each element is shown in the upper left. Indexing is also closely related to another term MATLAB users often hear: vectorization. but I'm getting errors, Indexing cannot yield multiple results. offers. What is this fallacy: Perfection is impossible, therefore imperfection should be overlooked, 1980s short story - disease of self absorption. So what does "x (n)= {1,2,5,7,0 . Worlds Best Technical Indicator. Based on Results will be the elements marked by X: Reference and some similar examples: tutorial on MATLAB matrix indexing. I didn't give you a downvote though, but your answer doesn't generalize to a matrix with arbitrary dimensions, which is probably more useful. The output is always in the form of a column vector. Your "1:end" means "1:numel(A)" here and is not useful. Thanks. your location, we recommend that you select: . 920 211 723 2 758 106 665 423 252 67 473 947 500 168 294 520 667 139 896 372 309 631 401 721 922 302 799 428 496 743. In addition, this question has already been answered and your answer doesn't add anything more meaningful to the already established answers. Find the treasures in MATLAB Central and discover how the community can help you! Indexing into a matrix with a single subscript in this way is often called linear indexing. Regular newsgroup contributor Peter Acklam posted this solution that uses sub2ind and linear indexing: Another MATLAB user posted this question: I want to get the maximum of each row, which isn't really a problem, but afterwards I want to set all the other elements to zero. https://www.mathworks.com/matlabcentral/answers/62860-extracting-a-column-from-a-matrix, https://www.mathworks.com/matlabcentral/answers/62860-extracting-a-column-from-a-matrix#answer_74431, https://www.mathworks.com/matlabcentral/answers/62860-extracting-a-column-from-a-matrix#comment_128389. Asking for help, clarification, or responding to other answers. Find the treasures in MATLAB Central and discover how the community can help you! 1 Answer Sorted by: 13 You can use the end operator to see the last ten rows, like such: array (end-9:end,:) This shows rows from 'last one'-9 (e.g. matlab - Extract a single column from a matrix - Stack Overflow Extract a single column from a matrix Ask Question Asked 10 years, 11 months ago Modified 10 years, 11 months ago Viewed 8k times 1 I have a matrix generated from the program written in Matlab something like this : MATLAB extracts the matrix elements corresponding to the nonzero values of the logical array. Unable to complete the action because of changes made to the page. When selecting whole columns or rows, the following format shall be used: The result is the elements in the intersection of the indexed rows and columns. Something can be done or not a fit? MathWorks is the leading developer of mathematical computing software for engineers and scientists. 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