Is the EU Border Guard Agency able to tell Russian passports issued in Ukraine or Georgia from the legitimate ones? For cases when there aren't exact matches available, you can use interpolation as shown in codes next -. Other model components include a regression component to associate the same exogenous predictor variables to each response series, and constant and time . @Divakar this can also be accomplished with logical indexing: We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. I want to find the minimum value of a matrix,the row and the column of it. subA = A (row, col) row or col value can be 1 value, can be a range, can be some blocks only Remember, MATLAB index value starts from 1, not zero row2 = A (2, :) ':' denotes all, since it is mentioned in col means all colums. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Can we use an interp2 function in this situation? That will give you the highest/topmost row in the first column where the min was located. The elseif and else blocks are optional. Asking for help, clarification, or responding to other answers. To select an entire row (or column), MATLAB . I want to find the row position of a value in a single-column matrix (with inserting the value), how to do that? That would be row(1). For column permutation, we take an example of a 3*3 matrix being permuted in such a way that its first column becomes the second one, the second becomes the third one and lastly, the third becomes the . Why would Henry want to close the breach? value = A (find (A (:,1)==row_data,1),find (A (1,:)==column_data,1)) giving us - value = 0.4000 Also, please be mindful of the precision issues involved with floating point numbers. Unable to complete the action because of changes made to the page. Is there a higher analog of "category with all same side inverses is a groupoid"? Accelerating the pace of engineering and science. In case of the row data is 0.2 and the column data is 0.2, for example. The variable indices contain two values in the above output, which means the element is present at index 1 and 4 inside the array or vector. These approaches are indexing by position, linear indexing, and logical indexing. Now I've renamed minA to valueToFind since it appears that you're not always looking to find the min values. MATLAB treats the array as a single column vector with each column appended to the bottom of the previous column. If you get an error, it is caused by another problem. If your Xq or Yq values are outside the X and Y ranges respectively, you need to do extrapolation, for which I think you can use scatteredInterpolant instead of interp2. the last element of A as maximum, then "row==numel(A)". The relational expression can be used in conjunction with find to find the indices of elements that meet the given condition. As you mentioned in your answer, in case of my row data is 0.2 and my column data is 0.2 (between 0.1 and 1). At what point in the prequels is it revealed that Palpatine is Darth Sidious? This shouldn't be a problem here because we have specifically mentioned the numbers and no other calculations had been done between matching and inputting the inputs. Counterexamples to differentiation under integral sign, revisited. I mean how can I get the row number, using the column number 2? Probably far less efficient than the first way. Thank you for your respond. Which is the way to write this command? The data I use in text file A: dat Y S 100 0.86 105 . Do you want one (if so, which one) or all of them. 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 am working with data that is in a 152867x2 matrix. Finding Minimum value: In the code below, we have created a sample matrix, in which we have passed " nrow=3 " (matrix will have only 3 rows) in example 1 and " ncol=8 " (matrix will have only 8 columns) in example 2 as a parameter while defining the matrix. 13 Comments My answer should be (2,3). MATLAB find row and column index of closest to specified value Matlab matching first column of a row as index and then averaging all columns in that row How to extract x and y values from ezplot function that plots a probability density function of a gaussian mixture model find and match multiple values in the same row in array in matlab Is there any reason on passenger airliners not to have a physical lock between throttles? I can't go looking at every entry when I'll have a million entries in a matrix. Not the answer you're looking for? How can I find values from that matrix? Find the values in the matrix that are greater than 7. c. Find the row and column numbers for the elements in the matrix that contain values greater than 7 and less than 30. d. Ready to optimize your JavaScript with Rust? Follow 1 view (last 30 days) Show older comments Patricia Fernandes on 9 Oct 2018 Vote 0 Link Commented: Patricia Fernandes on 9 Oct 2018 Accepted Answer: Matt J Theme Copy A= name age gender larry 4 M roy 6 M jim 6 F tom 8 M kim 9 F This shouldn't be a problem here because we have specifically mentioned the numbers and no other calculations had been done between matching and inputting the inputs. Find permutations of rows in matrix; Find rows in matrix where entries match certain constraints? @Sardar_Usama Ah, yes, correct. @Raghuram: The method works properly for matrices of any size (tested with 40000x40000). Thanks for contributing an answer to Stack Overflow! This is very helpful. How to check if a value exists in a dictionary? Choose a web site to get translated content where available and see local events and Just figured out that If I make a matrix. https://www.mathworks.com/matlabcentral/answers/214388-how-do-i-find-what-row-and-column-a-specific-element-is-in, https://www.mathworks.com/matlabcentral/answers/214388-how-do-i-find-what-row-and-column-a-specific-element-is-in#answer_177257, https://www.mathworks.com/matlabcentral/answers/214388-how-do-i-find-what-row-and-column-a-specific-element-is-in#comment_281934, https://www.mathworks.com/matlabcentral/answers/214388-how-do-i-find-what-row-and-column-a-specific-element-is-in#comment_281935, https://www.mathworks.com/matlabcentral/answers/214388-how-do-i-find-what-row-and-column-a-specific-element-is-in#comment_562217, https://www.mathworks.com/matlabcentral/answers/214388-how-do-i-find-what-row-and-column-a-specific-element-is-in#comment_1054946, https://www.mathworks.com/matlabcentral/answers/214388-how-do-i-find-what-row-and-column-a-specific-element-is-in#comment_2281240, https://www.mathworks.com/matlabcentral/answers/214388-how-do-i-find-what-row-and-column-a-specific-element-is-in#answer_177264. For example, consider a 3-by-3 matrix. If so, do something like this: Of course I called the variable "thisValueOfTheRow" but you can call it whatever you like. Do you just not know how to assign it to a variable "in code"? This will take each value multiplied by the row and column, and replace the zeros from the empty table in step 8. Why does my stock Samsung Galaxy phone/tablet lack some features compared to other Samsung Galaxy models? Now you've said that you have only one min value, which can be located anywhere. I was wondering if there is an innate function for this or how I would write the code for this. n = norm(A,p) ; Description. for column 1, i would get row 2 as the answer and for column 5, I would get row 1 as the answer. Do we need to interpolate to find the value. Then we have printed the sample matrix in the next line with the message . Choose a web site to get translated content where available and see local events and You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. mathworks.com/help/matlab/matlab_prog/preallocating-arrays.html. How can I index a MATLAB array returned by a function without first assigning it to a local variable? Thus, linear indexing numbers the elements in the columns from top to bottom, left to right. Now I've renamed minA to valueToFind since it appears that you're not always looking to find the min values. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. It's the same solution I've been telling you. MATLAB provides its user with a basket of functions, in this article we will understand a powerful function called 'Find'. The key now is how you define your problem so you want to find if row 79 has the first two values as row 99? Many MATLAB functions accept function handles as inputs so that you can evaluate functions over a range of values. MathWorks is the leading developer of mathematical computing software for engineers and scientists. SImilarly Theme Copy Home Services Web Development . The second column, however, has a unique value for each row (see example data below). Can virent/viret mean "green" in an adjectival sense? The row with the lowest column number is row 4 (row 4, col 2 has the min value). Sign in to answer this question. There are other ways I'm sure, such as functions in the various optimization toolboxes. You can have an answer with a few lines of code which is: %get row and column values of data matrix. Do bracers of armor stack with magic armor enhancements and special abilities? Please post the error message or explain the difference bewteen the results and your expectations. Note that as the linear indexing goes down column by column, the result here differs from the one in your example (although still a correct index), But to get this you could just transpose the A matrix (A.') Other MathWorks country Note that thisValueOfTheRow will equal 4. row(1) is the first row in the leftmost column where the criteria (which is yourArray == minValue) is met: [row, column] = find(yourArray == minValue); row and column are computed in column major order - in other words down the rows, then over column-by-column. . This is because the conjugate of a real number is the same number! n and m are small. but for that you have to take transpose of your A first, As in one of the comments Usama suggested preallocation of memory Can we keep alcoholic beverages indefinitely? In the United States, must state courts follow rulings by federal courts of appeals? Thanks for contributing an answer to Stack Overflow! your location, we recommend that you select: . Based on That is, there may be [9 5 X], and [3 8 X] and so on and on, and there are lots of different combinations, too many to manually do (a (:,1:2)== (a (1,1:2))) for. Please clarify how row(1) is not the value you're looking for because I guess I'm not understanding what you want then. of all the same min value whereas most likely only a single value is needed, even if the min shows up multiple times. Finding minimum value of a set of numbers in a column vector in Matlab. It is only suitable, if M (your matrix) is not very large, ie. index 4 & 5 having same value). Sign in to answer this question. [row, col] = ind2sub (size (A), index); In opposite to the solution of Image Analyst, this is faster, but considers only one value even if the minimal value appears multiple times in the array. how to display a certain range of rows from a sorted column based on a particular column value in matlab? [i,j,v] = find (X~=0) produces a vector v with all 1 s, and returns the row and column indices. data = rand (5, 3); [maxNum, maxIndex] = max (data (:)); [row, col] = ind2sub (size (data), maxIndex); Another less compact approach finds the max values for each column at first: Theme Copy data = rand (5, 3); [maxNumCol, maxIndexCol] = max (data); [maxNum, col] = max (maxNumCol); row = maxIndexCol (col); Please read "help max" also. A drawback with this solution is that you change the matrix A. I don't know if it's useful for OP but if one value of B is bigger than the max value of A your code will crash. X is your row: function ind = findRow (M,X) tmp = M - repmat (X,size (M,1),1); ind = find (tmp,1); end If M is too large, it might be faster, to iterate the rows of M and compare every row with your vector. It sounds like you have a situation where the min may occur many times but we still don't know which of them you want. Well the variable row = [4;1;6]. Other MathWorks country Are you saying that this approach gives the wrong result? Thank you but that isn't quite what I need. So in that case, you can use either solution - they'll both work in the case of a single min in a single location. '25' at row 3 and c. You may receive emails, depending on your. Computer Science questions and answers. I want to create an array with the values in column "J" based on the values in column "B". This is what i want,only one value.Because I dont understand the command,i have a matrix "x" and i want to save the value to "min_value". If it finds none, the function will return an empty matrix. To directly find the elements in X that satisfy the condition X5, . or a row or column at a time. Do non-Segwit nodes reject Segwit transactions with invalid signature? how to get the value of this row at column 1? Did neanderthals need vitamin C from the diet? This is a non-loop version. I have a matrix with the first row and the first column are data. It is a part of a large code i am making and i cannot explain all the logic above this.When i have one minimum value in many rows/columns i just want one of them randomly,because i need to use the row and column of it later in the code and it has no matter which of the possible row/column i have. rev2022.12.11.43106. Now, if you are looking to find the values corresponding to all the matches, use this -, Otherwise, if you are looking to find the value corresponding to just the first match, use this -. Find the time values: Theme. Sign in to comment. Translate. How can I use a VPN to access a Russian website that is banned in the EU? You could use imregionalmin() in the Image Processing Toolbox. How can I exclude all "permission denied" messages from "find"? Question is how to find rows and columns (sort by rows) in variable A from variable B. MATLAB stores strings as short pieces of text as character vectors, e. If str is a cell array of character vectors or a string array, then strfind returns a cell . SImilarly col3 = A (:, 3) fetching only 3rd col row24 = A ( [2 4], :) fetching value of 2nd & 4th row col1to3 = A (:, 1:3) It's the same solution I've been telling you. Find the treasures in MATLAB Central and discover how the community can help you! Akira Agata on 24 Oct 2018 0 Link Translate Another possible solution. I want to find the rows whose 7th element us equal to 1. My question is that how can you get this value of the row using a code? If any values are less than the value being compared with I want it to delete that entire row. Is energy "equal" to the curvature of spacetime? Your answer is okay. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Hi, thanks again. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. In opposite to the solution of Image Analyst, this is faster, but considers only one value even if the minimal value appears multiple times in the array. How does legislative oversight work in Switzerland when there is technically no "opposition" in parliament? https://www.mathworks.com/matlabcentral/answers/203754-minimum-value-row-and-column, https://www.mathworks.com/matlabcentral/answers/203754-minimum-value-row-and-column#answer_175429, https://www.mathworks.com/matlabcentral/answers/203754-minimum-value-row-and-column#comment_279202, https://www.mathworks.com/matlabcentral/answers/203754-minimum-value-row-and-column#comment_279213, https://www.mathworks.com/matlabcentral/answers/203754-minimum-value-row-and-column#comment_279238, https://www.mathworks.com/matlabcentral/answers/203754-minimum-value-row-and-column#comment_279273, https://www.mathworks.com/matlabcentral/answers/203754-minimum-value-row-and-column#comment_279387, https://www.mathworks.com/matlabcentral/answers/203754-minimum-value-row-and-column#comment_279390, https://www.mathworks.com/matlabcentral/answers/203754-minimum-value-row-and-column#comment_362702, https://www.mathworks.com/matlabcentral/answers/203754-minimum-value-row-and-column#comment_362710, https://www.mathworks.com/matlabcentral/answers/203754-minimum-value-row-and-column#comment_362722, https://www.mathworks.com/matlabcentral/answers/203754-minimum-value-row-and-column#comment_362766, https://www.mathworks.com/matlabcentral/answers/203754-minimum-value-row-and-column#comment_362794, https://www.mathworks.com/matlabcentral/answers/203754-minimum-value-row-and-column#comment_362809, https://www.mathworks.com/matlabcentral/answers/203754-minimum-value-row-and-column#answer_175397, https://www.mathworks.com/matlabcentral/answers/203754-minimum-value-row-and-column#comment_278933, https://www.mathworks.com/matlabcentral/answers/203754-minimum-value-row-and-column#comment_278934, https://www.mathworks.com/matlabcentral/answers/203754-minimum-value-row-and-column#comment_278935, https://www.mathworks.com/matlabcentral/answers/203754-minimum-value-row-and-column#answer_270330, https://www.mathworks.com/matlabcentral/answers/203754-minimum-value-row-and-column#comment_460802. For example the vector Z should contain only the values of "J" that are on the same row with the value "01" in column "B", vector X only the "03" and so on . index 4 & 5 having same value). Does a 120cc engine burn 120cc of fuel a minute? First you find the maximum of each row using rowMaximum=max (X, [],2); Then you replicate the maximum so that it has the same dimension as your input and compare it to the input logicalMaximum=repmat (rowMaximum,1,size (X,2))==X; And the last thing you wanna do is converting this logical array into your desired indexes 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). your location, we recommend that you select: . Look, from my example above which you referenced (I'm copying here): And I said the number you want would be row(1). So you can use Jan's solution. Thus, linear indexing numbers the elements in the columns from top to bottom, left to right. I need the code to give me the answer in a matrix form like Asking for help, clarification, or responding to other answers. Now let's consider, we want to . Is there a higher analog of "category with all same side inverses is a groupoid"? offers. How can I use values within a MATLAB matrix as indices to determine the location of data in a new matrix? On Windows platforms, MATLAB returns values in the range of INT_MIN to INT_MAX (-2147483647 to 2147483647). Deleting rows with specific rules; Matlab - find a missing time from a matrix and insert the missing time with a value; how to load txt contains different columns with different rows; Matlab - Extracting rows with specfic column value from table; Find handles with a specific pattern; Convention with rows and columns index for most of languages . thanks for answering before. The goal of this interaction is to allow effective operation and control of the machine from the human end, while the machine simultaneously feeds back information that aids the operators . In FSX's Learning Center, PP, Lesson 4 (Taught by Rod Machado), how does Rod calculate the figures, "24" and "48" seconds in the Downwind Leg section? 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. offers. Or is it another difference that I'm not aware of? For example, I have the matrix look like this. I am trying to create a sudoku solver for a project and I can't find a way to find which row and column an element is in. Connecting three parallel LED strips to the same power supply. For example, let's find the index of a single element present inside a given array. Best coding solution for query matlab: find the index of rows from the first matching column value. different Latin Squares of size N. Latin squares can be created using a simple indexing tric. In the first line you can get e.g. Can we keep alcoholic beverages indefinitely? A = randi ( [1 10],4,10); idx = any (A == 1); % Represents column index in which the value 1 is col = find (idx); % Represents column number in which the value 1 is Ready to optimize your JavaScript with Rust? More Answers (1) Bjorn Gustavsson on 30 Apr 2015 Vote 0 Link Seems you're asking for Theme Copy sub2ind HTH 0 Comments Sign in to comment. Thanks matlab indexing row Share Reload the page to see its updated state. Find the treasures in MATLAB Central and discover how the community can help you! Efficient way to collapse each row of a matrix based on a column index for each row, Compare column values against first row and retain original values in R. When would I give a checkpoint to my D&D party that they can return to if they die? How could my characters be tricked into thinking they are on Mars? For example if I had a 9 by 9 matrix I want to know what row and column a specific element is in. Answers (1) Jos (10584) on 1 Dec 2017. Use can use find and sub2ind to achieve what you want index the row 'ind' and need to return 'dat' column value of the correpsong row. Based on MathWorks is the leading developer of mathematical computing software for engineers and scientists. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, I appreciate your answer. 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