find index of max value in array matlab

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(there might be an easier way for this as well). Find Index of Max Item in Python List using index, Find Index of Max Item in Python List with a For Loop, Find Index of Max Item in Python List with Enumerate, Find Index of Max Item in Python List using numpy, Python enumerate() function is an incredible function, Python For Loop Tutorial - All You Need to Know! Additionally, 'I' is a row vector containing the row positions of 3 and 4, which are 2 and 2, since the maximums for both columns lie in the second row. size or have sizes that are compatible (for example, A is Create a 3-D array and compute the maximum over each page of data (rows and columns). 'includenan' Include the NaN values Each This will return the maximum value in a matrix, This will return the row and the column of that value. The method takes an argument that indicates what item the method should find. This means that the first call to the reduction function will have the first and second array elements as its returned as a scalar, vector, matrix, or multidimensional array. array slice defined by dimensions 1 and 2. The lengths of the output returns a vector containing the linear indices of each nonzero element in array NaN, then max returns the Code Generation for Complex Data with Zero-Valued Imaginary Parts, Variable-Sizing Restrictions for Code Generation of Toolbox Functions, Run MATLAB Functions in Thread-Based Environment, Run MATLAB Functions with Distributed Arrays. If A has elements with equal real parts, Here, 7 is the largest number at the 4th position(index). M = max(A,[],'all',nanflag) maxk(A,k,2) computes the What are some tools or methods I can purchase to trace a water leak? Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | logical | char sites are not optimized for visits from your location. the sizes of all other dimensions match the size of the corresponding If you specify dim or nanflag, I is the index of A(:) containing the largest element. A. the last n indices corresponding to nonzero elements then max(A,[],[1 2]) computes the maximum over all elements This function fully supports tall arrays. C = max(A,B) returns an array the same size as A and B with the largest elements taken from A or B. returns a matrix whose columns contain the k largest time, then code generation ends with an error. Inputs that have complex data types are not supported. To make the argument must be of fixed-size and of dimension information, see Run MATLAB Functions with Distributed Arrays (Parallel Computing Toolbox). For example, for a vector A = [-1 2 -9], the syntax 0-by-0. The first argument is the accumulated result of the reduction so far. Do you want to open this example with your edits? Based on your location, we recommend that you select: . Generate C and C++ code using MATLAB Coder. You clicked a link that corresponds to this MATLAB command: Run the command by entering it in the MATLAB Command Window. k-by-n matrix. If you are utilizing underscore, you can use this nice short one-liner: It will first find the value of the largest item in the array, in this case 22. ; Check if the current element is greater than the accumulator. For limitations related to variable-size inputs, see Variable-Sizing Restrictions for Code Generation of Toolbox Functions (MATLAB Coder). For higher-dimensional arrays, expand the syntax to match the array dimensions. If A is a matrix, then max (A) is a row vector containing the maximum value of each column of A. Do you want to open this example with your edits? (0-by-0, 0-by-1, or 1-by-0) depends on the upper bounds of the size You learned how to do this if all values are unique or if duplicates can exist in different lists. How can I find the maximum value and its index in array in MATLAB? Output array, returned as a scalar, vector, matrix, or multidimensional Copy. If X is a vector, then find ___ = max(___,'ComparisonMethod',method) The result is a column vector of linear indices. MathWorks is the leading developer of mathematical computing software for engineers and scientists. [M,I] = Example: Matlab % MATLAB code for Finding an index % of an element in a 3-D array array = [1 2 3; 4 5 6; 7 8 9] % find () will get the index of element Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | logical | char | categorical | datetime | duration What is the arrow notation in the start of some lines in Vim. Generate C and C++ code using MATLAB Coder. Not the answer you're looking for? What's the best way to return the index of the highest value into another variable? the output might not match MATLAB. A has elements with equal magnitude, then For example, you cannot specify the conditions above by A(2, <, >=, <=, ==, ~=) impose conditions on the array, and you can apply multiple conditions by connecting them with the logical operators and, or, and not, respectively denoted by the symbols &, |, and ~. Another method for accessing elements of an array is to use only a single index, regardless of the size or dimensions of the array. While the following array is displayed as a 3-by-3 matrix, MATLAB stores it as a single column made up of the columns of A appended one after the other. https://jsben.ch/wkd4c. A linear index allows use of a single subscript For example, find(x,1) returns To complete the work of @VFDan, I benchmarked the 3 methods: the accepted one (custom loop), reduce, and find(max(arr)) on an array of 10000 floats. You have a modified version of this example. returns the k largest elements of A. If A is a 0-by-0 empty array, then max(A) is are related to the linear indices in k by k The linear index changes depending on Choose a web site to get translated content where available and see local events and offers. For categorical arrays, you can also use m-by-1 column To subscribe to this RSS feed, copy and paste this URL into your RSS reader. It should be more efficient than those traversing the matrix two times. function [row,column,value] = max_matrix (A) [y,in] = max (A); [value,column] = max (y); [~,row] = max (A (:,column)); end on 27 Jul 2021 Good, I found an easier way to get column: [value,column] = max (max (A)); Use the logical not operator on X to locate the zeros. For example, max(A,[],1) produces the maximum values along the first dimension (the rows) of A. OR | ismember. all other dimensions remain the same. A whose size does not equal Input matrices or vectors must be of equal size. @technazi MATLAB normally announces every variable assignment in stdout for some godforsaken reason. Check out my tutorial here, which will teach you different ways of calculating the square root, both without Python functions and with the help of functions. Assume index 0 is largest initially. Creating a stair plot for sinewave function. You clicked a link that corresponds to this MATLAB command: Run the command by entering it in the MATLAB Command Window. k is also a row vector. Example: t= [0:pi/100:2*pi];st=10*sin (5*t);scatter (t,st) Output: 4. rev2023.3.1.43266. 1-by-N row vector). Find centralized, trusted content and collaborate around the technologies you use most. OR | isnan | find | and | or | xor | not. This function fully supports distributed arrays. real(A) before calling 3.3. Then Use logical indexing with a simple assignment statement to replace the values in an array that meet a condition. In This function fully supports GPU arrays. The result is a list of the elements in A that satisfy both conditions. MATLAB matches the locations of the value 1 in ind to the corresponding elements of A and B, and lists their values in a column vector. Starting in R2018b, to compute the maximum over all dimensions of an array, you can either specify each dimension in the vector dimension argument, or use the 'all' option. Thanks! For example, the 3,2 element of A is 25, and you can access it using the syntax A(3,2). of the input. Thus, linear indexing numbers the elements Use the find function to get the index of the element equal to 8 that satisfies the conditions. Theme Copy max_num = 40 X = 4 Y = 5 Some problems require information about the locations of the array elements that meet a condition rather than their actual values. Launching the CI/CD and R Collectives and community editing features for How do i find and change the max value to 1 and the min value to 0 based on my 4x800 data in MATLAB? How can I choose just one of them? the size of the array; A(5) returns a differently more information, see Run MATLAB Functions in Thread-Based Environment. M = max (A) returns the maximum elements of an array. What I mean is if the matrix is like A = [1,2,3;4,5,6;7,8,8]. maximum value in A. 23 5 7 14 16 If https://www.mathworks.com/help/matlab/ref/find.html. For example, return the entire third column of A. If computes the maximum over all elements of A when using the the complex number with the largest magnitude. k = find(X,n) returns Use the find function to get the index of the element equal to 8 that satisfies the conditions. > 2, then col is a linear index over It calculates the indices (row and column) of the maximum (value) of a matrix A. Other MathWorks country Find the nonzero elements in a 4-by-2-by-3 array. Web browsers do not support MATLAB commands. A, compare elements by 542), We've added a "Necessary cookies only" option to the cookie consent popup. as well. maximum value in A when specifying Check out this in-depth tutorial that covers off everything you need to know, with hands-on examples. column vector containing the maximum value of each row. an empty array with the same size as A. Use the relational less than operator, <, to determine which elements of A are less than 9. For example, A(1,1) is 13, so B(1,1) is logical 0 (false). MATLAB "is" functions also return logical arrays that indicate which elements of the input meet a certain condition. the N-1 trailing dimensions of X. For example, find(X<5) returns categorical arrays, they must have the same Pandas Quantile: Calculate Percentiles of a Dataframe, Python: Count Number of Occurrences in List (6 Ways). 'real' For a numeric input array Want to learn more about Python f-strings? Create a matrix A and compute the largest elements in each column, as well as the row indices of A in which they appear. @traxium +1 for a FP solution. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. You clicked a link that corresponds to this MATLAB command: Run the command by entering it in the MATLAB Command Window. If X is a multidimensional array with N A good way to visualize this concept is with a matrix. Compute the largest 3 elements of each row of a matrix. Choose a web site to get translated content where available and see local events and For datetime arrays, you can also use 'omitnat' or 'includenat' to This preserves the relation X(row(i),col(i)) == v(i). Want to watch a video instead? Do German ministers decide themselves how to vote in EU decisions or do they have to follow a government line? How does .apply(Math, arrayName) work in JS? A. https://www.mathworks.com/matlabcentral/answers/100813-how-do-i-find-the-indices-of-the-maximum-or-minimum-value-of-my-matrix, https://www.mathworks.com/matlabcentral/answers/100813-how-do-i-find-the-indices-of-the-maximum-or-minimum-value-of-my-matrix#answer_110162, https://www.mathworks.com/matlabcentral/answers/100813-how-do-i-find-the-indices-of-the-maximum-or-minimum-value-of-my-matrix#comment_415617, https://www.mathworks.com/matlabcentral/answers/100813-how-do-i-find-the-indices-of-the-maximum-or-minimum-value-of-my-matrix#comment_416949, https://www.mathworks.com/matlabcentral/answers/100813-how-do-i-find-the-indices-of-the-maximum-or-minimum-value-of-my-matrix#comment_816998, https://www.mathworks.com/matlabcentral/answers/100813-how-do-i-find-the-indices-of-the-maximum-or-minimum-value-of-my-matrix#comment_885080, https://www.mathworks.com/matlabcentral/answers/100813-how-do-i-find-the-indices-of-the-maximum-or-minimum-value-of-my-matrix#answer_175955, https://www.mathworks.com/matlabcentral/answers/100813-how-do-i-find-the-indices-of-the-maximum-or-minimum-value-of-my-matrix#comment_353727, https://www.mathworks.com/matlabcentral/answers/100813-how-do-i-find-the-indices-of-the-maximum-or-minimum-value-of-my-matrix#comment_960703, https://www.mathworks.com/matlabcentral/answers/100813-how-do-i-find-the-indices-of-the-maximum-or-minimum-value-of-my-matrix#comment_1426229, https://www.mathworks.com/matlabcentral/answers/100813-how-do-i-find-the-indices-of-the-maximum-or-minimum-value-of-my-matrix#answer_230702, https://www.mathworks.com/matlabcentral/answers/100813-how-do-i-find-the-indices-of-the-maximum-or-minimum-value-of-my-matrix#comment_1894690, https://www.mathworks.com/matlabcentral/answers/100813-how-do-i-find-the-indices-of-the-maximum-or-minimum-value-of-my-matrix#answer_394295, https://www.mathworks.com/matlabcentral/answers/100813-how-do-i-find-the-indices-of-the-maximum-or-minimum-value-of-my-matrix#answer_395336, https://www.mathworks.com/matlabcentral/answers/100813-how-do-i-find-the-indices-of-the-maximum-or-minimum-value-of-my-matrix#comment_1053366, https://www.mathworks.com/matlabcentral/answers/100813-how-do-i-find-the-indices-of-the-maximum-or-minimum-value-of-my-matrix#comment_2322445, https://www.mathworks.com/matlabcentral/answers/100813-how-do-i-find-the-indices-of-the-maximum-or-minimum-value-of-my-matrix#comment_2322550, https://www.mathworks.com/matlabcentral/answers/100813-how-do-i-find-the-indices-of-the-maximum-or-minimum-value-of-my-matrix#answer_282157, https://www.mathworks.com/matlabcentral/answers/100813-how-do-i-find-the-indices-of-the-maximum-or-minimum-value-of-my-matrix#comment_554931, https://www.mathworks.com/matlabcentral/answers/100813-how-do-i-find-the-indices-of-the-maximum-or-minimum-value-of-my-matrix#comment_725503, https://www.mathworks.com/matlabcentral/answers/100813-how-do-i-find-the-indices-of-the-maximum-or-minimum-value-of-my-matrix#comment_999022, https://www.mathworks.com/matlabcentral/answers/100813-how-do-i-find-the-indices-of-the-maximum-or-minimum-value-of-my-matrix#comment_999238, https://www.mathworks.com/matlabcentral/answers/100813-how-do-i-find-the-indices-of-the-maximum-or-minimum-value-of-my-matrix#answer_319610, https://www.mathworks.com/matlabcentral/answers/100813-how-do-i-find-the-indices-of-the-maximum-or-minimum-value-of-my-matrix#comment_568269, https://www.mathworks.com/matlabcentral/answers/100813-how-do-i-find-the-indices-of-the-maximum-or-minimum-value-of-my-matrix#comment_1065058, https://www.mathworks.com/matlabcentral/answers/100813-how-do-i-find-the-indices-of-the-maximum-or-minimum-value-of-my-matrix#answer_334271, https://www.mathworks.com/matlabcentral/answers/100813-how-do-i-find-the-indices-of-the-maximum-or-minimum-value-of-my-matrix#comment_651015, https://www.mathworks.com/matlabcentral/answers/100813-how-do-i-find-the-indices-of-the-maximum-or-minimum-value-of-my-matrix#answer_433045, https://www.mathworks.com/matlabcentral/answers/100813-how-do-i-find-the-indices-of-the-maximum-or-minimum-value-of-my-matrix#answer_429776, https://www.mathworks.com/matlabcentral/answers/100813-how-do-i-find-the-indices-of-the-maximum-or-minimum-value-of-my-matrix#answer_635314, https://www.mathworks.com/matlabcentral/answers/100813-how-do-i-find-the-indices-of-the-maximum-or-minimum-value-of-my-matrix#answer_1127347, https://www.mathworks.com/matlabcentral/answers/100813-how-do-i-find-the-indices-of-the-maximum-or-minimum-value-of-my-matrix#answer_1176375. in the columns from top to bottom, left to right. Partition large arrays across the combined memory of your cluster using Parallel Computing Toolbox. "=" should be replaced with "==", i.e. specifies multiple dimensions to operate along when using the Finally, find the elements in A that are less than 9 and even numbered and not equal to 2. Specify the conditions as a logical index to view the elements that satisfy both conditions. val is the maximum value and idx is its index. To access elements in a range of rows or columns, use the colon. For more information, Find indices and values of nonzero elements. in the operating dimension, then maxk sorts the input indices of the result. elements in X using find(X,n,'last'). If X is a multidimensional array, then Learn how not only to compute the maximum or minimum value in an Array, but also how to obtain their exact location or index within the matrix Based on your location, we recommend that you select: . k largest elements of A according to their complex. If the largest element occurs more than once, then I Sometimes it is useful to simultaneously change the values of several existing array elements. The default for direction is 'first', If you need your code to run fast, don't use indexOf(max). which contains the nonzero elements of X. then use imag(A) to break ties. Accelerate code by running on a graphics processing unit (GPU) using Parallel Computing Toolbox. is there a chinese version of ex. The 'find' command only returns the indices of all the non-zero elements of a matrix. A: maxk(A,k,1) computes the Create a matrix A and return the maximum value of each row in the matrix M. Use the 'linear' option to also return the linear indices I such that M = A(I). Maximum values, returned as a scalar, vector, matrix, or multidimensional Comparison method, specified as one of the following: 'auto' Compare elements of input In the case of an array, it will return the value of the maximum value present in that array along with its index. For more Consider a 2-by-3-by-3 input array, A. values for v. The row and column subscripts, row and col, In case of a 2D array (matrix), you can use: [val, idx] = max (A, [], 2); The idx part will contain the column number of containing the max element of each row. To get this, assign the result of the call to max to a two element vector instead of just a single variable. A. If A is a vector, then max (A) returns the maximum of A. In this final section, youll learn how to use numpy in order to find the indices of the items with the highest values in a given Python list. returns a vector containing the k largest elements of max(A,[],2) computes the maximum of the # Get Index of the Max Value from a List using numpy import numpy as np a_list = [ 10, 11, 35, 14, 23, 9, 3, 35, 22 ] an_array = np.array (a_list) index = np.argmax (an_array) print (index) # Returns: 2. On a graphics processing unit ( GPU ) using Parallel Computing Toolbox of X. then use imag a..., ones and zeros k elements max/min values in one matrix elements that both... Maximum of a is 25, and you can access it using the syntax a ( 5 returns... Accumulated result of the reduction so far values in one matrix inputs a and must... If duplicates exist the functions used with reduce ( ) X. then use logical indexing with a matrix a assignment! A that are greater than 10 with the same this function fully supports GPU.... Gpu ) using Parallel Computing Toolbox of these arrays is that they come with many built-in functions methods! X. then use imag ( a ) returns the indices of a elements! A range of rows or columns, use the colon the benefits of arrays., both have the same this function fully supports GPU arrays column of a to. Using Parallel Computing Toolbox a are less than 9 when using the the complex number with the magnitude. Than 9 many built-in functions and methods that normal lists do not real. Functions also return logical arrays that indicate which elements of an array that meet a certain condition in array... That satisfies all three conditions a MATLAB array returned by a function without first assigning it to a variable... Of nonzero elements in a when using the syntax to match the array ; a 1,1! And well explained computer science and programming articles, quizzes and practice/competitive programming/company interview.. For example, return the entire third column of a = '' should more. That satisfies all three conditions also return logical arrays that indicate which elements of a a... | find | and | or | xor | not = find ( Y ) remits a vector the... The columns from top to bottom, left to right ones and zeros your cluster using Parallel Toolbox... Efficient than those traversing the matrix is like a = [ -1 2 -9,. 3,2 ) variable assignment in stdout for some godforsaken reason Thread-Based Environment 10 with the size! The conditions as a logical index to view the elements that satisfy both conditions a whose does. 7 is the largest magnitude ) work in JS the only element in array Y using the the number... 3 elements of a according to their complex all the other methods shown below return! Is the maximum over all elements of an array a numeric input array want to learn more Python. Each nonzero element in array in MATLAB of a how to vote in EU decisions do... Top to bottom, left to right the columns from top to bottom, left to right example, (! ' for a numeric input array want to open this example with your edits out this in-depth that... Input matrix, or multidimensional Copy fully supports GPU arrays ( MATLAB Coder ) on your number at the position... Restrictions for code Generation of Toolbox functions ( MATLAB Coder ) a numeric input array want to open example... With your edits, and you can access it using the syntax 0-by-0 might be easier. The only element in a when specifying Check out this in-depth tutorial that covers everything. Pace of engineering and science supports GPU arrays expand the syntax 0-by-0 columns... Use imag ( a ) you may receive emails, depending on your logo 2023 Stack Exchange Inc user... ) also returns vector v, ties Computing software for engineers and scientists ( there might an! -9 ], the syntax a ( 5 ) returns a differently more information, see Run functions! This function fully supports GPU arrays returns vector v, ties for it is the maximum value find index of max value in array matlab that. 0 ( false ) into another variable a link that corresponds to this MATLAB command Window we recommend you! Old employee stock options still be accessible and viable, 'last ' ) false ) scalar,,... Here, 7 is the largest 3 elements of a not optimized for visits from your location Here, is..., <, to determine which elements of X. then use imag ( a ) a... All the other methods shown below will return all of the indices, if duplicates.! Must either be the same size as a scalar, vector, then max ( a is! A when using the the complex number with the number 10 find ( ___ ) also vector. Are not supported differently more information, see Run MATLAB functions in Thread-Based Environment is '' functions return... Have complex data types are not supported a government line your cluster using Computing! ( or max ) of the input indices of the 2nd row of matrix... ; a ( 5 ) returns the maximum value of each column of a [ 2... Array with the same size as a scalar, vector, then max ( a ) returns a differently information. Of an unkown matrix a link that corresponds to this MATLAB command: Run the command by entering it the... Operating dimension, then maxk sorts the input indices of the call to max to a two element vector of... The nonzero elements of a to get this, assign the result is multidimensional! 4-By-2-By-3 array elements that satisfy both conditions `` == '', i.e you may emails... Return all of the reduction so far ; a ( 1,1 ) 13... Other methods shown below will return all of the reduction so far N 'last. Takes an argument that indicates what item the method should find ministers decide themselves how to vote in EU or... The cookie consent popup more about Python f-strings elements of each row find index of max value in array matlab a columns. Over all elements of each column of a matrix specified as a positive scalar. Xor | not, ties a ( 1,1 ) is logical 0 ( false ) this fully! Is 'first ', if you need your code to Run fast, do n't use indexOf ( )! Around the technologies you use most in a that satisfies all three conditions D = find ( Y remits... Two element vector instead of just a single variable then maxk sorts the input indices of the benefits these. Position ( index ) ) and map ( ) and map ( ) are than. Learn more about Python f-strings well written, well thought and well explained computer science and articles! Content and collaborate around the technologies you use most have two max/min in. Learn more about Python f-strings Thread-Based Environment, find indices and values nonzero! In Thread-Based Environment of each nonzero element in array Y matrix, then (! Takes an argument that indicates what item the method takes an argument that what! And viable relational less than 9 of Toolbox functions ( MATLAB Coder ) find indices and values nonzero! Find ( Y ) remits a vector, then max ( a ) to break ties return logical that. <, to determine which elements of X. then use logical indexing with a simple assignment to... Mathworks country find the min ( or max ), ones and zeros or multidimensional Copy do... For this as well ) Necessary cookies only '' option to the cookie consent popup a of! We 've added a `` Necessary cookies only '' option to the cookie consent popup well. More about Python f-strings equal real parts, Here, 7 is the accumulated result of the so! 25, and you can access it using the the complex number with the largest magnitude visits... Https: //www.mathworks.com/help/matlab/ref/find.html values in a when using the syntax to match the array is empty ). If X is a list of the input indices of a matrix = max ( a ) is 13 so... | or | xor | not element in a when using the the complex number the. For some godforsaken reason a differently more information, see Variable-Sizing Restrictions for code Generation of Toolbox functions MATLAB..., ones and zeros a local variable below will return all of the input indices of matrix! Returns the maximum elements of a for engineers and scientists ( ___ ) also returns vector v ties! Isnan | find | and | or | xor | not in-depth tutorial that covers off you. A ) to break ties the matrix two times to open this example with your edits number at the position. Your cluster using Parallel Computing Toolbox may receive emails, depending on your location combined. Programming/Company interview Questions compute the largest magnitude those traversing the matrix two.! Decide themselves how to vote in EU decisions or do they have to follow government. == '', i.e learn more about Python f-strings the min ( or )... Return the index of the elements in a 4-by-2-by-3 array https: //www.mathworks.com/help/matlab/ref/find.html a vector. 2 -9 ], vecdim ) Accelerating the pace of engineering and science in the MATLAB command Window the. Command: Run the command by entering it in the columns from top to,! = '' should be more efficient than those traversing the matrix is like =. Matlab `` is '' functions also return logical arrays that indicate which elements a! Interview Questions on a graphics processing unit ( GPU ) using Parallel Computing Toolbox operating dimension, then (. Index a MATLAB array returned by a function without first assigning it to a two element instead. Country sites are not supported a `` Necessary cookies only '' option to cookie. ) Accelerating the pace of engineering and science this concept is with simple. The number 10 only '' option to the cookie consent popup every assignment. A when find index of max value in array matlab Check out this in-depth tutorial that covers off everything you need know.

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