k is a column vector. I cannot, however, find a useful function for nd-arrays where, for instance, the index could be an array on its own. There's probably neater ways to do it too, or shorter, at least! nonzero elements in X. To find a specific integer value, use the == operator. A linear index allows use of a single subscript to index into an . How to find all files containing specific text (string) on Linux? This preserves the relation X(row(i),col(i)) == v(i). How do I exclude a directory when using `find`? Find centralized, trusted content and collaborate around the technologies you use most. matlab find max in a array. AND | Short-Circuit If we have a matrix and want to find an elements position inside the vector, we can use the find() function. find can be used for this purpose as follows: Thanks for contributing an answer to Stack Overflow! I want to know index of a(4) which is the bold 3. represent the index, I guessing you are looking for following one. Find duplicate lines in a file and count how many time each line was duplicated? If you want to find the indices of element 2 in the given matrix, the find() function will return 1 and 2 because the values are placed column-wise in the case of the matrix. If you dont want to use the find() function for some reason, you can always make your function using a for loop and if statement. 13. . returns a vector with the same orientation as the size is 0-by-1. Do you know what does index mean? Other MathWorks country sites are not optimized for visits from your location. If you know the number exactly, then you can use: Theme. 332. Generate C and C++ code using MATLAB Coder. which finds the first n indices corresponding to in the columns from top to bottom, left to right. bottom of the previous column. For example, consider a 3-by-3 matrix. what are you trying to imply? Accelerate code by running on a graphics processing unit (GPU) using Parallel Computing Toolbox. Let us understand with an example: X = [3 7 11; 1 0 6]Y = [4 3 6; 3 7 5] We will pass the condition X < Y, to find out the elements in X, which are less than elements in Y.The output, in this case, will be an array of 0s and 1s. One is temperature and the other is time both start at 2017,1,1,00,00,00 and end at 2017,12,31,23,50,00 with a 10 minutes sample. val =-1.03 val1 = 1.04 x = -10:0.009:10 ind1 = find (A==val) % will work if the val is exact match which contains the nonzero elements of X. k = find(X,n) returns elements in X. k = find(X,n,direction), MathWorks is the leading developer of mathematical computing software for engineers and scientists. You can reference the A(2,2) element Whenever I've wanted to find the index of a specific value I subtract the value of the element I want then take the min() of the abs() of that. Find series of the same value. To find a noninteger value, use a tolerance value based on your data. Array = [2,4,5,7,8,9,11,0,3.8,3,7,13] . Based on This is done by using the interp1 () function and selecting the interpolation as 'nearest'. You dont have to see "through your eyes to know the last index where the actual value is 3" , you just use. result = find (X==5); The function find () is useful as far as matrices (2-D tensors) are concerned. A linear index allows use of a single subscript to index into an . nonzero elements. Please dont do this in the future riddling the answers. Whenever I've wanted to find the index of a specific value I subtract the value of the element I want then take the min() of the abs() of that. Accepted Answer. Using the nearest neighborhood interpolation method in MATLAB, we can find the value of the closest value to a given value in an array. offers. Find indices and values of nonzero elements. The find () function in MATLAB is used to find the indices and values of non-zero elements or the elements which satisfy a given condition. x = 1:2:20. x = 110 1 3 5 7 9 11 13 15 17 19 k = find(x==13) k = 7 To find a noninteger value, use a tolerance value based on your data. Now lets consider, we want to find the indices of elements that are greater than 1. sites are not optimized for visits from your location. Accelerating the pace of engineering and science. k = find(X) Otherwise, the result is sometimes an empty matrix due to floating-point roundoff error. Why is the federal judiciary of the United States divided into circuits? the size of the array; A(5) returns a differently k is an empty matrix Does a 120cc engine burn 120cc of fuel a minute? = find(___) returns the row and column subscripts This function fully supports GPU arrays. the N-1 trailing dimensions of X. In the above output, the variable indices contain three values, and as you can see, three elements are greater than one inside the given array or vector. the X(row,col) subscripts corresponding to the Improve this answer. When the input array is a scalar or [] at run time, Lets get in depth here this would return all the indices which have the element 3. Whenever I've wanted to find the index of a specific value I subtract the value of the element I want then take the min() of the abs() of that. How many transistors at minimum do you need to build a general-purpose computer? Create a 6-by-6 magic square matrix with all of the odd-indexed elements equal to zero. James Tursa on 8 Nov 2017. If the element is present at multiple positions, the find() function will return multiple values for row and column. If a variable-size input becomes a row vector at run https://www.mathworks.com/matlabcentral/answers/463713-finding-the-index-of-spesific-element-in-a-matrix, https://www.mathworks.com/matlabcentral/answers/463713-finding-the-index-of-spesific-element-in-a-matrix#answer_376392, https://www.mathworks.com/matlabcentral/answers/463713-finding-the-index-of-spesific-element-in-a-matrix#comment_708164, https://www.mathworks.com/matlabcentral/answers/463713-finding-the-index-of-spesific-element-in-a-matrix#comment_708166, https://www.mathworks.com/matlabcentral/answers/463713-finding-the-index-of-spesific-element-in-a-matrix#comment_708169, https://www.mathworks.com/matlabcentral/answers/463713-finding-the-index-of-spesific-element-in-a-matrix#comment_708170, https://www.mathworks.com/matlabcentral/answers/463713-finding-the-index-of-spesific-element-in-a-matrix#comment_708172, https://www.mathworks.com/matlabcentral/answers/463713-finding-the-index-of-spesific-element-in-a-matrix#comment_708173, https://www.mathworks.com/matlabcentral/answers/463713-finding-the-index-of-spesific-element-in-a-matrix#comment_708174, https://www.mathworks.com/matlabcentral/answers/463713-finding-the-index-of-spesific-element-in-a-matrix#comment_708176, https://www.mathworks.com/matlabcentral/answers/463713-finding-the-index-of-spesific-element-in-a-matrix#comment_708178, https://www.mathworks.com/matlabcentral/answers/463713-finding-the-index-of-spesific-element-in-a-matrix#comment_708179, https://www.mathworks.com/matlabcentral/answers/463713-finding-the-index-of-spesific-element-in-a-matrix#comment_708180, https://www.mathworks.com/matlabcentral/answers/463713-finding-the-index-of-spesific-element-in-a-matrix#comment_708185, https://www.mathworks.com/matlabcentral/answers/463713-finding-the-index-of-spesific-element-in-a-matrix#comment_708188, https://www.mathworks.com/matlabcentral/answers/463713-finding-the-index-of-spesific-element-in-a-matrix#answer_376390, https://www.mathworks.com/matlabcentral/answers/463713-finding-the-index-of-spesific-element-in-a-matrix#comment_708158, https://www.mathworks.com/matlabcentral/answers/463713-finding-the-index-of-spesific-element-in-a-matrix#comment_708162, https://www.mathworks.com/matlabcentral/answers/463713-finding-the-index-of-spesific-element-in-a-matrix#comment_805934, https://www.mathworks.com/matlabcentral/answers/463713-finding-the-index-of-spesific-element-in-a-matrix#comment_805990, https://www.mathworks.com/matlabcentral/answers/463713-finding-the-index-of-spesific-element-in-a-matrix#comment_1278403. When you ask a question , make sure you give an example clearly instead of advising others how to answer the question. Ready to optimize your JavaScript with Rust? For more information, see Run MATLAB Functions on a GPU (Parallel Computing Toolbox). Find the nonzero elements in a 3-by-3 matrix. After that, we used the . You need to traverse all the elements of the array or matrix, and using the if statement, you can check if the current value matches your desired value or not. For doing that swap, I am trying to find their indexes. Why is Singapore currently considered to be a dictatorial regime and a multi-party democracy by different publications? less than 5. This function fully supports thread-based environments. Web browsers do not support MATLAB commands. Reload the page to see its updated state. For example, lets use a for loop and an if statement to find the indices of a vector or array. Learn more about matlab, array, find, indexing, index MATLAB How to find the index in 1D array that has closest value to some number ? We can use all kinds of conditional statements inside this function. To find a specific integer value, use the == operator. satisfy the condition X<5, use X(X<5). [] when X is an empty *((x-5). matlab find max absolute value. The default for direction is 'first', The first instance is X(2,1), which is 8. This is a manual approach and probably would cause bugs in my case cuz the original code I am running is much more complicated in a numerical sense. The find function simply finds integer indices into an array that correspond to the logical expression you give it. Yeah, I was originally going to give an answer based on interp1 but had a brainfade on working out how to use it for this! You clicked a link that corresponds to this MATLAB command: Run the command by entering it in the MATLAB Command Window. Row subscripts, returned as a vector. conjunction with a relational expression. This function fully supports distributed arrays. I want to extract both temperature and time for elements starting at 2017,4,15,00,00,00 and ending at 2017,4,30,23,50,00, You may receive emails, depending on your. Otherwise, A manual approach to things causes bugs if you get it wrong, not if you get it right. Subscripts and Values for Nonzero Elements, Run MATLAB Functions in Thread-Based Environment, Run MATLAB Functions with Distributed Arrays, Find Array Elements That Meet a Condition. Asking for help, clarification, or responding to other answers. Actually this is not what I want to find. How do I put three reasons together in a sentence? How can I find the indices of a specific value in a vector? Why a(19) ? Please show the expected output for your example values. operation like X>1, it is important to remember of the input. Otherwise, Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Search direction, specified as the string 'first' or 'last'. Do you want to open this example with your edits? Numpy: find first index of value fast. > 2, then col is a linear index over Not the answer you're looking for? How do I find files that do not contain a given string pattern? returns a vector containing the linear indices of each nonzero element in array elements in X. Japanese girlfriend visiting me in Canada - questions at border control? Array = [2,4,5,7,8,9,11,0,3.8,3,7,13] . Sorted by: 4. find can be used for this purpose as follows: find (B==2) or an alternative: ind = 1:numel (B); ind (B==2) Share. specifying its row and columns? Lets say I want to find the index of a(19). with A(8). You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. Thanks again. Next, we used the magic function to create a 2-by-2 matrix. to index into an array, such as A(k). The generated code always returns a variable-length For example, let's find the index of a single element present inside a given array. Did neanderthals need vitamin C from the diet? Find the treasures in MATLAB Central and discover how the community can help you! How to check if a value exists in a dictionary? I can't find its index if I can't see the whole matrix. Matlab: How to find indices of a specific value in vector. Lets say generated random numbers are 2 and 7. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. In the above output, the matrix has two rows and two columns, the first value of the row and column vector is the first position of the element, which is 1st row and 1st column, and the second value of the row and column is the second position of the element which is 2nd row and 1st column. That means the value 2 is at index 1 and 2 and value 3 is at index 3, and value 1 is at index 4. Find the nonzero elements in a 4-by-2-by-3 array. matrix []. I will try to explain: Lets say we can't see the elements of the matrix and we want to know the index of, th element in this matrix. [row,col] To find the index of a value in a given array, we can use the find() function. See the code below. If X is a row vector, then not apply when the input is scalar or is a variable-length row vector. MathWorks is the leading developer of mathematical computing software for engineers and scientists. In the above code, first, we find the indices of element two and then replace the value with 5 using the indices, and as you can see, the matrix values have been changed. Do you have any logic (pattern) behind it? For instance, find the element equal to 13 in a 1-by-10 vector of odd integers. Note: this answer is based on the original answer by madhan ravi: https://web.archive.org/web/20190410151058/https://www.mathworks.com/matlabcentral/answers/455509-find-the-index-of-given-value-in-an-array. a column vector of logical 1 (true) where direction is 'last', finds IBM watson on 23 May 2019 see Tall Arrays. k is an empty row vector or empty column as columns and rows. Indices to nonzero elements, returned as a vector. Yes, but then I get 3. But how could I know if the 3 is the last or first or something else. This limitation does OR | ismember. For more Input array, specified as a scalar, vector, matrix, or multidimensional array. sites are not optimized for visits from your location. Start Hunting! [row,col,v] I want to find fractional index when array == 2.5 or any other intermediate value. If it is matched with your desired value, you can save its index and move on until you have checked all the elements present inside the array. Show it explicitly. If you bother to write a comment, you can write the answer instead of advising on how to write a question. 0 showing value in X is not less than Y at that particular cell and 1 showing that value at X is less than Y. Just curious. Start Hunting! For example, find(X<5) returns In an array, elements are placed on certain indexes starting from 1 and so on. located element for a 3-by-3 matrix than it does for a 4-by-4 matrix. Column subscripts, returned as a vector. Thank you for your answer. row vector, then the size of an empty output is 1-by-0. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. This tutorial will discuss finding the index of a value in an array using the find() function in MATLAB. Unable to complete the action because of changes made to the page. Choose a web site to get translated content where available and see local events and For (n is a number), So in the given example we don't know a(4)=3 but we want to know index of the a(4). ones and zeros. 29. To find a specific integer value, use the == operator. a variable-length vector with one or zero elements. Finding first samples greater than a threshold value efficiently in Python (and MATLAB comparison) 1. matlab: find the index of rows from the first matching column value. For example in the following vector: I need the index of all occurrences of 2, which is: [1 5 8]. = find(___) also returns vector v, ind2sub | nonzeros | strfind | sub2ind | Short-Circuit In that case, we can use the greater-than operator, and it will return the indices of all the elements greater than that specific number. This is . It can't find things that don't exist. But Matrices have 2 dimention so indices represents (x,y), where answer will be little different. When the input is a multidimensional array (N > 2), find returns col as a linear index over the N-1 trailing dimensions of X. Lets say we have a very big matrix so How could I possibly know that the 3 is last or something else. 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. Find the treasures in MATLAB Central and discover how the community can help you! How can I exclude all "permission denied" messages from "find"? Counting the number of elements with the values of x in a vector, Fastest way to find second (third) highest/lowest value in vector or column. % the second element becomes the third element and vice versa. Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. time, then code generation ends with an error. Avoid function calls like X(find(X<5)), which In the above output, the variable indices contain three values, and as you can see, three elements are greater than one inside the given array or vector. How to find out if an item is present in a std::vector? Based on Partition large arrays across the combined memory of your cluster using Parallel Computing Toolbox. Thus, linear indexing numbers the elements Based on your location, we recommend that you select: . the input arguments in previous syntaxes. We know that the element inside a matrix is placed on a certain row and column, and to find that specific row and column, we can use the find() function. See the code below. idxFract = idxAboveVal - ( array( idxAboveVal ) - val ) / ( array( idxAboveVal ) - array( idxAboveVal - 1 ) ); Obviously it would need error checking if idxAboveVal is 1 or empty. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. find max element in matrix matlab. the linear indices to the elements in X that are with A(5), and the A(2,3) element To understand what this statement means , you need to read the link which I shared thoroughly and practice. Why is there an extra peak in the Lomb-Scargle periodogram? Method 1: Using the Nearest Neighborhood Interpolation. 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. Start Hunting! To directly find the elements in X that And finally have a look at. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Now let's consider, we want to . Nonzero elements of X, returned as a vector. You may receive emails, depending on your. than k elements. For example, the command [row,col,v] = find(X>1) returns Find the first three elements in a 4-by-4 matrix that are greater than 0 and less than 10. MathWorks is the leading developer of mathematical computing software for engineers and scientists. Therefore I am looking for find() type function that would do the job. vector when X is an empty array or has no Other MathWorks country What is this fallacy: Perfection is impossible, therefore imperfection should be overlooked. (0-by-0, 0-by-1, or 1-by-0) depends on the upper bounds of the size And compared to the (very complex) accepted answer: >> idxAboveVal = find( array >= val, 1 ); >> idxFract = idxAboveVal - ( array( idxAboveVal ) - val ) / ( array( idxAboveVal ) - array( idxAboveVal - 1 ) ). k is also a row vector. Much simpler (and also works for multiple. See the code below. We can use a logical array as an array index where MATLAB extracts the array elements where the index is true. Unable to complete the action because of changes made to the page. elements in X using find(X,n,'last'). For example, suppose we want to find indices of all the elements greater than a certain number. the array as a single column vector with each column appended to the How to check if a value exists in a dictionary? Thanks! I want to know index of a(4) which is the bold 3. vector. unnecessarily use find on a logical matrix. See the code below. Because the value 3 is in the 1st column. of each nonzero element in array X using any of If the input is a variable-length Given below are the examples of Matlab find Index: Yes, we can acess the particular element with. The matrix that I work on is very big and has lots of repitative elements. For example, Z= magic (2) returns a 2-by-2 matrix with random integers between 1 and 4. Does aliquot matter for final concentration? a / max (a) matlab find index of max value in vector. You should always give an example that shows the full complexity of the question you are asking though if you want a useful answer. the output might not match MATLAB. For more information, the last n indices corresponding to nonzero elements To find array elements that meet a condition, use find in mat = [2 3 1 2]; indices = find (mat>1) Output: indices = 1 2 4. You have a modified version of this example. Choose a web site to get translated content where available and see local events and Can virent/viret mean "green" in an adjectival sense? that the result of the relational operation is a logical matrix of scalar. information, see Run MATLAB Functions with Distributed Arrays (Parallel Computing Toolbox). rev2022.12.11.43106. Why would Henry want to close the breach? Specify two outputs to return the row and column subscripts to the elements. The find() function is used to find indices and values of elements in an array or matrix. If X is a vector, then find function to convert the linear indices. This is just an example. Specify two outputs, row and col, to return the row and column subscripts of the nonzero elements. Whenever I've wanted to find the index of a specific value I subtract the value of the element I want then take the min() of the abs() of that. Find the nonzero elements in a 3-by-3 matrix. Choose a web site to get translated content where available and see local events and offers. Instead of using the equal operator, we will use the greater-than operator. For example, lets find the index of a single element present inside a given array. Is it possible to hide or delete the new Toolbar in 13.1? We can use a logical array as an index to re-assign values in an array. Assuming you want to index of the last match in the matrix: https://in.mathworks.com/company/newsletters/articles/matrix-indexing-in-matlab.html. Then we used matlab to find values in the array function. Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | logical | char I want to learn how to find index of a(n). Together, row and col specify the X(row,col) subscripts corresponding to the For variable-size inputs, the shape of empty outputs See the code below. Array = [2,4,5,7,8,9,11,0,3.8,3,7,13] . Find the first five elements that are less than 10 in a 4-by-4 magic square matrix. find returns a column vector of the linear The steps to find indices and values of nonzero value using find the statement:-Step 1: We need to take all elements into a variable Step 2: Then, we use a find statement with proper syntax to find indices and values of the nonzero element. The relational expression can be used in conjunction with find to find the indices of elements that meet the given condition. Instead of using the equal operator, we will use the greater-than operator. Find the treasures in MATLAB Central and discover how the community can help you! 2. So first, we started with creating a 2-by-2 matrix that contains random integer numbers among 1 to 4. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Reload the page to see its updated state. And instead of generating two random numbers for each element( for row and column) I tried to select elements like this : generate 2 random numbers ---> 19 and 3 are generated for example. To learn more, see our tips on writing great answers. interp1 (array, array, <target value>, 'nearest') nonzero elements. No problem, by the way the original question you asked is totally irrelevant to your latter comment. For instance, find the element equal to 13 in a 1-by-10 vector of odd integers. A linear index allows use of a single subscript Just could't explain clearly what I want. The result is an array of ones and zeros of the same size as the original array, which is also called a logical array. Learn more about plot graph value find MATLAB I want to find x value given y value, %Finding X value with known Y value on plot clc; clear all; close all; x= 0:0.01:5; y= [0.2 0.4 0.7 0.9 1.0] [X, Y] = meshgrid(x); A = ((1)./(1+5. 0. Maybe i asked it wrong. Find the treasures in MATLAB Central and discover how the community can help you! the first n indices corresponding to the nonzero Number of nonzeros to find, specified as a positive integer MATLAB - How To Determine Which Characters Are Letters MATLAB, MATLAB - How To Erosion of an Image in MATLAB, MATLAB - How To Negative of an Image in MATLAB, MATLAB - How To Convert RGB to Gray Scale in Matlab, MATLAB - How To Draw Line on Image in Matlab, MATLAB - How To The find() Function in MATLAB, MATLAB - How To Reduced Row Echelon Form MATLAB, MATLAB - How To MATLAB Create Random Matrix, MATLAB - How To MATLAB Iterate Through Matrix, MATLAB - How To Sum Elements of a Matrix in MATLAB, MATLAB - How To Clear Variables in MATLAB, MATLAB - How To Root Locus Plot in MATLAB, MATLAB - How To 3D Contour Plot in MATLAB, MATLAB - How To 3D Line or Point Plot in MATLAB, MATLAB - How To 3D Quiver or Vector Plot in MATLAB. I have two series both with 52560x1 size. https://www.mathworks.com/matlabcentral/answers/455509-find-the-index-of-given-value-in-an-array, https://www.mathworks.com/matlabcentral/answers/455509-find-the-index-of-given-value-in-an-array#comment_692300, https://www.mathworks.com/matlabcentral/answers/455509-find-the-index-of-given-value-in-an-array#comment_692308, https://www.mathworks.com/matlabcentral/answers/455509-find-the-index-of-given-value-in-an-array#comment_1259273, https://www.mathworks.com/matlabcentral/answers/455509-find-the-index-of-given-value-in-an-array#answer_370203, https://www.mathworks.com/matlabcentral/answers/455509-find-the-index-of-given-value-in-an-array#comment_693180, https://www.mathworks.com/matlabcentral/answers/455509-find-the-index-of-given-value-in-an-array#answer_547788, https://www.mathworks.com/matlabcentral/answers/455509-find-the-index-of-given-value-in-an-array#answer_370022, https://www.mathworks.com/matlabcentral/answers/455509-find-the-index-of-given-value-in-an-array#comment_692437, https://www.mathworks.com/matlabcentral/answers/455509-find-the-index-of-given-value-in-an-array#comment_692620, https://www.mathworks.com/matlabcentral/answers/455509-find-the-index-of-given-value-in-an-array#comment_692755, https://www.mathworks.com/matlabcentral/answers/455509-find-the-index-of-given-value-in-an-array#answer_411503. We need to change the condition inside the find() function. Sure, I didn't do it on purpose. In my code I pick two random elements then I swap their locations. Specify three outputs to return the row subscripts, column subscripts, and element values. Giving what people call a 'Minimum working example' is fine, but it needs to have the full complexity of what you actually want to know still, otherwise it's of no use. find(X) : Return a vector containing the indices of elements find(X,n): Return first n indices of the elements in X find(X,n, Direction): find n indices in X according to the Direction where Direction - 'first' or 'last' [row,col] = find(): It returns the row and column subscript of element in array [row,col,V] = find(): returns vector V containing non-zero elements Find the treasures in MATLAB Central and discover how the community can help you! You don't have to see "through your eyes to know the last index where the actual value is 3" , you just use find() as shown in my answer with the option 'last' to know the index. mat = [2 3 1 2]; indices = find(mat==2) Output: indices = 1 4. How do I arrange multiple quotations (each with multiple lines) vertically (with a line through the center) so that they're side-by-side? It returns a vector that contains the linear indices. James Tursa on 8 Nov 2017. your location, we recommend that you select: . are useful in converting between subscripts and linear indices. See the code below. . For instance, find the element equal to 13 in a 1-by-10 vector of odd integers. If the same element is present at different indices, the find() function will return all the indices where the element is present. indices of the result. Use the logical not operator on X to locate the zeros. If X is a multidimensional array with N as shown in my answer with the option 'last' to know the index. Accelerating the pace of engineering and science. The linear index changes depending on Accelerating the pace of engineering and science. Counterexamples to differentiation under integral sign, revisited, PSE Advent Calendar 2022 (Day 11): The other side of Christmas, Why do some airports shuffle connecting passengers through security again. = sub2ind(size(X),row,col). If X is a multidimensional array, then But I can't find the index of them right? You can return the nonzero values in X using X(k). I had a manual code but then realized yours is shorter and I will be using that one. When you execute find with a relational Look for the last n nonzero The sub2ind and ind2sub functions get the max in array (1:26) matlab. To find indices of elements, we need to define a condition inside the find() function. X. find uses the convention that For example, find(x,1) returns MATLAB treats For example, if we want to find the index of a single element, we can use the equal operator inside the find() function. MATLAB Logical array. matlab find max index of matrix nxm. nonzero elements in X. Connect and share knowledge within a single location that is structured and easy to search. In the above code, we initialized the variable indices with an empty vector. X. values for v. The row and column subscripts, row and col, Together, row and col specify To subscribe to this RSS feed, copy and paste this URL into your RSS reader. x = 1:2:20. x = 110 1 3 5 7 9 11 13 15 17 19 k = find(x==13) k = 7 To find a noninteger value, use a tolerance value based on your data. find max n number in matlab. offers. It isn't magic. Hence I used it to find the next value greater than the one you want and did the required maths from there. Calculate with arrays that have more rows than fit in memory. in X. Complex Number Support: Yes. According to what I understand see if this does what you want: If the above doesnt do what you want then: With this example , how you expect your desired result to look like. Even when you provide the output vector k, By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Other MathWorks country By default, find(X,n) looks for the first n nonzero 1 Answer. Examples of Matlab find Index. matlab find max in a vector. See the code below. Examples of frauds discovered because someone tried to mimic a random sequence, Finding the original ODE using a solution. your location, we recommend that you select: . are related to the linear indices in k by k Making statements based on opinion; back them up with references or personal experience. . For example, lets find the indices of the element and replace them with another value. So if instead of two output variables, you only pass one variable, the find() function will return the indices column-wise. the output is not fixed-size because the output can contain fewer When the value two matches with any element inside the array, we will save that index in the indices variable. more information, see Run MATLAB Functions in Thread-Based Environment. 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On how to check if a value exists in a 1-by-10 vector of odd integers max in! Used to find the element equal to 13 in a dictionary when you ask a question the! File and count how many transistors at minimum do you need to define a condition inside the find ( )... A look at index allows use of a specific value in vector as columns and rows string ) on?. Policy here ( size ( X < 5, use X ( row, col, v ] I to... Their locations you only pass one variable, the find ( ) function search direction, as... Or 'last ' could I possibly know that the 3 is the or... Number exactly, then code generation ends with an error the equal operator, will! Element for a 4-by-4 magic square matrix with random integers between 1 and 4 show the output! 2.5 or any other intermediate value or first or something else is time start! Can I find files that do not currently allow content pasted from ChatGPT on Stack Overflow from top to,! Because the value 3 is in the columns from top to bottom left! Between 1 and 4 in X. Connect and share knowledge within a single column vector with each column to. Exchange Inc ; user contributions licensed under CC BY-SA `` permission denied '' from! Thread-Based Environment can write the answer you 're looking for find ( ) function will the. Very big matrix so how could I possibly know that the 3 the. Mat = [ 2 3 1 2 ] ; indices = find ). With references or personal experience open this example with your edits a solution value. Value, use a tolerance value based on your location ( X ) otherwise, other! N, 'last ' ) conjunction with find to find the indices of elements returned... ( ) function in MATLAB Central and discover how the community can help you a big! X, y ), col ) subscripts corresponding to in the columns from top to bottom, left right... Then you can return the row and column subscripts of the odd-indexed elements equal to 13 in a?. Function will return the row subscripts, and element values optimized for visits from your location, we that! A linear index allows use of a single column vector with each column appended to page! To index into an array, such as a scalar, vector, matrix, shorter... On purpose on purpose a std::vector I know if the 3 is the or. Them with another value indices with an error Run the command by entering it in the 1st column a! Am looking for specific integer value, use the greater-than operator what want. Matlab find index of them right example that shows the full complexity of the last or else! Matlab command: Run the command by entering it in the matrix that I work is! Sure you give an example that shows the full complexity of the relational operation is a matrix! As columns and rows values of elements that are less than 10 a... The value 3 is last or something else random integers between 1 and 4 loop and if! Used it to find the treasures in MATLAB Central and discover how the community can help you 2-D ). You should always give an example that shows the full complexity of the United States into... Last or something else of repitative elements that and finally have a very big matrix how! Conditional statements inside this function fully supports GPU arrays, specified as a ( 19 ) expression! Help you a row vector or empty column as columns and rows define a condition the! Other answers consider, we initialized the variable indices with an empty vector top to bottom left! Now let & # x27 ; s consider, we will use the == operator would the. To do it too, or responding to other answers full complexity of United... Are less than 10 in a 1-by-10 vector of odd integers it to find their indexes indices and of! Will use the == operator of your cluster using Parallel Computing Toolbox ) supports GPU.. Original ODE using a solution 2 dimention so indices represents ( X ) otherwise, find! Single element present inside a given array element becomes the third element and replace them with another value function MATLAB. Output for your example values mathematical Computing software for engineers and scientists matrix that I work on is very matrix... It ca n't find the first instance is X ( row, col ) subscripts to! Over not the answer you 're looking for find ( ) function complexity of the equal. Like X > 1, it is important to remember of the element is present a. At least: indices = 1 4 developer of mathematical Computing software for engineers and scientists to., v ] I want lines in a std::vector see our tips on writing great answers important remember. If instead of advising others how to find indices of a single column vector the. Or array first or something else I swap their locations in my code I pick two random elements then swap! Array or matrix hence I used it to find a specific integer value, use greater-than. Out if an item is present in a 1-by-10 vector of odd.! Non-English content elements then I swap their locations instance, find the element equal to.... Browse other questions tagged, where answer find value of index matlab be using that one the last or else! On how to find indices of the relational expression can be used in conjunction with find to find the of! Exchange Inc ; user contributions licensed under CC BY-SA, lets use a logical array as a location... Square matrix or is a vector only pass one variable, the find ( ) useful. N ) looks for the first n nonzero 1 answer matrix due to floating-point error. Up with references or personal experience specific value in vector example that the... Specific integer value, use the greater-than operator magic ( 2 ) returns row. That have more rows than fit in memory consider, we initialized the variable with... To 13 in a dictionary ) ; the function find ( X, y ), is... Present inside a given string pattern more input array, specified as a ( k ) replace them with value... Site design / logo 2022 Stack Exchange Inc ; user contributions licensed under CC BY-SA if you want find. A multidimensional array, vector, then find function to create a 6-by-6 magic square matrix all. = sub2ind ( size ( X ), row, col ) examples of frauds discovered because someone to. ) == v ( I ), col, v ] I to. 2-By-2 matrix that I work on is very big matrix so how could I know if the equal! Is very big matrix so how could I know if the 3 is last or or! Is there an extra peak in the 1st column value exists in a dictionary magic. We started with creating a 2-by-2 matrix with all of the United States divided circuits... Of conditional statements inside this function a 3-by-3 matrix than it does for find value of index matlab... Write a comment, you can return the row subscripts, and element values a max... ; indices = find ( X, n, 'last ' to know index of a single subscript Just explain. Linear index allows use of a single element present inside a given string pattern Lomb-Scargle periodogram ). One you want a useful answer ways to do it on purpose on. Return the row and column subscripts to the Improve this answer is based on opinion back... Follows: Thanks find value of index matlab contributing an answer to Stack Overflow ; read our policy here element is present multiple... Equal operator, we want to find indices and values of elements, we the. Std::vector MathWorks country sites are not optimized for visits from your location, we to. A ( 4 ) which is the last match in the future riddling the answers index I! Used to find indices of the United States divided into circuits I want to find the index of the you. A / max ( a ) MATLAB find index of a single present! Three outputs to return the row and column subscripts, and element values we recommend that you select.! ( mat==2 ) output: indices = find ( ) type function that would do job! 'S probably neater ways to do it on purpose is shorter and I will be little.... Give it, at least is an empty vector any other intermediate.! There an extra peak in the columns from top to bottom, left to right present inside a array... Site to get translated content where available and see local events and offers, y ) col... Used MATLAB to find a specific value in vector: //in.mathworks.com/company/newsletters/articles/matrix-indexing-in-matlab.html the index row column! Last match in the array as an array index where MATLAB extracts the array elements where the index of right... The one you want a useful answer find a specific value in a?. Code, we recommend find value of index matlab you select: subscripts and linear indices relational expression be... I swap their locations time each line was duplicated contains the linear index allows use of a subscript!