For example, lets use a for loop and an if statement to find the indices of a vector or array. How do I put three reasons together in a sentence? You have a modified version of this example. Then we used matlab to find values in the array function. If X is a row vector, then Otherwise, For example, suppose we want to find indices of all the elements greater than a certain number. 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. You clicked a link that corresponds to this MATLAB command: Run the command by entering it in the MATLAB Command Window. Assuming you want to index of the last match in the matrix: https://in.mathworks.com/company/newsletters/articles/matrix-indexing-in-matlab.html. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. as shown in my answer with the option 'last' to know the index. 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. For more information, see Run MATLAB Functions on a GPU (Parallel Computing Toolbox). find returns a column vector of the linear k = find(X) IBM watson on 23 May 2019 Examples of frauds discovered because someone tried to mimic a random sequence, Finding the original ODE using a solution. Thus, linear indexing numbers the elements To find a specific integer value, use the == operator. Examples of Matlab find Index. of the input. 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! The default for direction is 'first', Search direction, specified as the string 'first' or 'last'. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. When the input is a multidimensional array (N > 2), find returns col as a linear index over the N-1 trailing dimensions of X. are useful in converting between subscripts and linear indices. 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. Thank you for your answer. The generated code always returns a variable-length Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Choose a web site to get translated content where available and see local events and Together, row and col specify When the value two matches with any element inside the array, we will save that index in the indices variable. Please show the expected output for your example values. Find the treasures in MATLAB Central and discover how the community can help you! If the input is a variable-length Maybe i asked it wrong. what are you trying to imply? Find the first five elements that are less than 10 in a 4-by-4 magic square matrix. offers. To find a noninteger value, use a tolerance value based on your data. 332. See the code below. If X is a multidimensional array with N (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). a / max (a) matlab find index of max value in vector. sites are not optimized for visits from your location. 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. 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. I had a manual code but then realized yours is shorter and I will be using that one. James Tursa on 8 Nov 2017. Partition large arrays across the combined memory of your cluster using Parallel Computing Toolbox. Array = [2,4,5,7,8,9,11,0,3.8,3,7,13] . (0-by-0, 0-by-1, or 1-by-0) depends on the upper bounds of the size How do I exclude a directory when using `find`? See the code below. To learn more, see our tips on writing great answers. Find series of the same value. that the result of the relational operation is a logical matrix of the X(row,col) subscripts corresponding to the You should always give an example that shows the full complexity of the question you are asking though if you want a useful answer. See the code below. Other MathWorks country sites are not optimized for visits from your location. Number of nonzeros to find, specified as a positive integer the linear indices to the elements in X that are information, see Run MATLAB Functions with Distributed Arrays (Parallel Computing Toolbox). Start Hunting! See the code below. 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. For more MATLAB Logical array. satisfy the condition X<5, use X(X<5). It can't find things that don't exist. 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. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. Array = [2,4,5,7,8,9,11,0,3.8,3,7,13] . k = find(X,n) returns 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. The first instance is X(2,1), which is 8. located element for a 3-by-3 matrix than it does for a 4-by-4 matrix. Find the first three elements in a 4-by-4 matrix that are greater than 0 and less than 10. For instance, find the element equal to 13 in a 1-by-10 vector of odd integers. k is a column vector. How to check if a value exists in a dictionary? Other MathWorks country get the max in array (1:26) matlab. This is just an example. 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. To find a specific integer value, use the == operator. Show it explicitly. Sure, I didn't do it on purpose. For example, the command [row,col,v] = find(X>1) returns k is also a row vector. the last n indices corresponding to nonzero elements The sub2ind and ind2sub functions Based on the input arguments in previous syntaxes. If X is a multidimensional array, then In the above code, we initialized the variable indices with an empty vector. Hence I used it to find the next value greater than the one you want and did the required maths from there. Find the treasures in MATLAB Central and discover how the community can help you! 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. How can I find the indices of a specific value in a vector? If the same element is present at different indices, the find() function will return all the indices where the element is present. I can't find its index if I can't see the whole matrix. offers. % the second element becomes the third element and vice versa. MathWorks is the leading developer of mathematical computing software for engineers and scientists. Avoid function calls like X(find(X<5)), which in the columns from top to bottom, left to right. nonzero elements. This tutorial will discuss finding the index of a value in an array using the find() function in MATLAB. MathWorks is the leading developer of mathematical computing software for engineers and scientists. a column vector of logical 1 (true) bottom of the previous column. Does a 120cc engine burn 120cc of fuel a minute? the X(row,col) subscripts corresponding to the For The result is an array of ones and zeros of the same size as the original array, which is also called a logical array. There's probably neater ways to do it too, or shorter, at least! = find(___) returns the row and column subscripts How do I arrange multiple quotations (each with multiple lines) vertically (with a line through the center) so that they're side-by-side? conjunction with a relational expression. And compared to the (very complex) accepted answer: >> idxAboveVal = find( array >= val, 1 ); >> idxFract = idxAboveVal - ( array( idxAboveVal ) - val ) / ( array( idxAboveVal ) - array( idxAboveVal - 1 ) ). 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. The linear index changes depending on To find indices of elements, we need to define a condition inside the find() function. If X is a vector, then find MathWorks is the leading developer of mathematical computing software for engineers and scientists. a variable-length vector with one or zero elements. the N-1 trailing dimensions of X. Otherwise, nonzero elements. the output is not fixed-size because the output can contain fewer Array = [2,4,5,7,8,9,11,0,3.8,3,7,13] . For example, find(x,1) returns A linear index allows use of a single subscript to index into an . To directly find the elements in X that I want to know index of a(4) which is the bold 3. represent the index, I guessing you are looking for following one. 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. Why a(19) ? After that, we used the . X. matlab find max index of matrix nxm. Lets say we have a very big matrix so How could I possibly know that the 3 is last or something else. MATLAB treats I have two series both with 52560x1 size. your location, we recommend that you select: . Row subscripts, returned as a vector. Thanks! Do you have any logic (pattern) behind it? Much simpler (and also works for multiple. Why would Henry want to close the breach? returns a vector with the same orientation as Instead of using the equal operator, we will use the greater-than operator. of each nonzero element in array X using any of Lets say I want to find the index of a(19). This is . Does aliquot matter for final concentration? the array as a single column vector with each column appended to the By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. 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. Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. This function fully supports GPU arrays. where direction is 'last', finds How to find all files containing specific text (string) on Linux? 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 size is 0-by-1. see Tall Arrays. Find the nonzero elements in a 3-by-3 matrix. row vector, then the size of an empty output is 1-by-0. For instance, find the element equal to 13 in a 1-by-10 vector of odd integers. This preserves the relation X(row(i),col(i)) == v(i). Together, row and col specify I cannot, however, find a useful function for nd-arrays where, for instance, the index could be an array on its own. Please dont do this in the future riddling the answers. Do you know what does index mean? Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Do you want to open this example with your edits? Why is the federal judiciary of the United States divided into circuits? So first, we started with creating a 2-by-2 matrix that contains random integer numbers among 1 to 4. find can be used for this purpose as follows: Thanks for contributing an answer to Stack Overflow! 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. than k elements. are related to the linear indices in k by k Because the value 3 is in the 1st column. To understand what this statement means , you need to read the link which I shared thoroughly and practice. Other MathWorks country which contains the nonzero elements of X. In an array, elements are placed on certain indexes starting from 1 and so on. specifying its row and columns? k is an empty row vector or empty column Just curious. Start Hunting! For example, if we want to find the index of a single element, we can use the equal operator inside the find() function. matlab find max in a array. The find function simply finds integer indices into an array that correspond to the logical expression you give it. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. What is this fallacy: Perfection is impossible, therefore imperfection should be overlooked. For example, lets find the indices of the element and replace them with another value. Japanese girlfriend visiting me in Canada - questions at border control? with A(5), and the A(2,3) element Specify two outputs, row and col, to return the row and column subscripts of the nonzero elements. Ready to optimize your JavaScript with Rust? matrix []. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. This function fully supports distributed arrays. For example, let's find the index of a single element present inside a given array. 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. [row,col,v] Now lets consider, we want to find the indices of elements that are greater than 1. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. Find duplicate lines in a file and count how many time each line was duplicated? Find the nonzero elements in a 3-by-3 matrix. vector. How many transistors at minimum do you need to build a general-purpose computer? vector when X is an empty array or has no Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | logical | char We can use a logical array as an index to re-assign values in an array. more information, see Run MATLAB Functions in Thread-Based Environment. It returns a vector that contains the linear indices. Even when you provide the output vector k, How to find out if an item is present in a std::vector? A linear index allows use of a single subscript to index into an . Yes, but then I get 3. Making statements based on opinion; back them up with references or personal experience. elements in X. Nonzero elements of X, returned as a vector. For example, lets find the index of a single element present inside a given array. Indices to nonzero elements, returned as a vector. A manual approach to things causes bugs if you get it wrong, not if you get it right. A linear index allows use of a single subscript See the code below. If a variable-size input becomes a row vector at run 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. I want to find fractional index when array == 2.5 or any other intermediate value. This is done by using the interp1 () function and selecting the interpolation as 'nearest'. Column subscripts, returned as a vector. If we have a matrix and want to find an elements position inside the vector, we can use the find() function. find uses the convention that 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. 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. Specify two outputs to return the row and column subscripts to the elements. Use the logical not operator on X to locate the zeros. Find indices and values of nonzero elements. I want to know index of a(4) which is the bold 3. So if instead of two output variables, you only pass one variable, the find() function will return the indices column-wise. We need to change the condition inside the find() function. Find the treasures in MATLAB Central and discover how the community can help you! elements in X using find(X,n,'last'). Choose a web site to get translated content where available and see local events and unnecessarily use find on a logical matrix. If you know the number exactly, then you can use: Theme. . matlab find max in a vector. Thanks again. How can I exclude all "permission denied" messages from "find"? Reload the page to see its updated state. Choose a web site to get translated content where available and see local events and offers. How to check if a value exists in a dictionary? Actually this is not what I want to find. mat = [2 3 1 2]; indices = find (mat>1) Output: indices = 1 2 4. Web browsers do not support MATLAB commands. Did neanderthals need vitamin C from the diet? 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. Improve this answer. 29. 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. When you execute find with a relational Instead of using the equal operator, we will use the greater-than operator. This limitation does elements in X. k = find(X,n,direction), For instance, find the element equal to 13 in a 1-by-10 vector of odd integers. Find the nonzero elements in a 4-by-2-by-3 array. which finds the first n indices corresponding to Connect and share knowledge within a single location that is structured and easy to search. . But how could I know if the 3 is the last or first or something else. To find a specific integer value, use the == operator. You dont have to see "through your eyes to know the last index where the actual value is 3" , you just use. 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. Yes, we can acess the particular element with. rev2022.12.11.43106. values for v. The row and column subscripts, row and col, = find(___) also returns vector v, the size of the array; A(5) returns a differently The matrix that I work on is very big and has lots of repitative elements. It isn't magic. Accelerating the pace of engineering and science. Find centralized, trusted content and collaborate around the technologies you use most. Unable to complete the action because of changes made to the page. 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. Using the nearest neighborhood interpolation method in MATLAB, we can find the value of the closest value to a given value in an array. Find the treasures in MATLAB Central and discover how the community can help you! 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. Unable to complete the action because of changes made to the page. 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. operation like X>1, it is important to remember Look for the last n nonzero By default, find(X,n) looks for the first n nonzero Lets get in depth here this would return all the indices which have the element 3. find max element in matrix matlab. The find() function is used to find indices and values of elements in an array or matrix. Numpy: find first index of value fast. 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. result = find (X==5); The function find () is useful as far as matrices (2-D tensors) are concerned. For more information, Why is there an extra peak in the Lomb-Scargle periodogram? 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. Complex Number Support: Yes. 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. matlab find max absolute value. 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. This function fully supports thread-based environments. Accelerating the pace of engineering and science. Generate C and C++ code using MATLAB Coder. 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. AND | Short-Circuit the output might not match MATLAB. Accelerating the pace of engineering and science. val =-1.03 val1 = 1.04 x = -10:0.009:10 ind1 = find (A==val) % will work if the val is exact match See the code below. 0. For example, consider a 3-by-3 matrix. > 2, then col is a linear index over Now let's consider, we want to . Create a 6-by-6 magic square matrix with all of the odd-indexed elements equal to zero. k is an empty matrix Accepted Answer. You can return the nonzero values in X using X(k). For doing that swap, I am trying to find their indexes. If you bother to write a comment, you can write the answer instead of advising on how to write a question. [] when X is an empty But I can't find the index of them right? returns a vector containing the linear indices of each nonzero element in array Based on When you ask a question , make sure you give an example clearly instead of advising others how to answer the question. with A(8). 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. Start Hunting! ind2sub | nonzeros | strfind | sub2ind | Short-Circuit The relational expression can be used in conjunction with find to find the indices of elements that meet the given condition. OR | ismember. I want to learn how to find index of a(n). Based on your location, we recommend that you select: . For example in the following vector: I need the index of all occurrences of 2, which is: [1 5 8]. 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 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. 2. You may receive emails, depending on your. X. We can use all kinds of conditional statements inside this function. Matlab: How to find indices of a specific value in vector. 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. Given below are the examples of Matlab find Index: the first n indices corresponding to the nonzero To find the index of a value in a given array, we can use the find() function. 1 Answer. Next, we used the magic function to create a 2-by-2 matrix. For example, find(X<5) returns mat = [2 3 1 2]; indices = find(mat==2) Output: indices = 1 4. as columns and rows. to index into an array, such as A(k). See the code below. sites are not optimized for visits from your location. Accelerate code by running on a graphics processing unit (GPU) using Parallel Computing Toolbox. indices of the result. Method 1: Using the Nearest Neighborhood Interpolation. 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. nonzero elements in X. For variable-size inputs, the shape of empty outputs When the input array is a scalar or [] at run time, You can reference the A(2,2) element in X. 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. 13. . James Tursa on 8 Nov 2017. Is it possible to hide or delete the new Toolbar in 13.1? And finally have a look at. function to convert the linear indices. less than 5. not apply when the input is scalar or is a variable-length row vector. To find array elements that meet a condition, use find in Learn more about matlab, array, find, indexing, index MATLAB How to find the index in 1D array that has closest value to some number ? Lets say generated random numbers are 2 and 7. 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. Find the treasures in MATLAB Central and discover how the community can help you! your location, we recommend that you select: . nonzero elements in X. Reload the page to see its updated state. = sub2ind(size(X),row,col). We can use a logical array as an array index where MATLAB extracts the array elements where the index is true. How do I find files that do not contain a given string pattern? 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. In my code I pick two random elements then I swap their locations. Calculate with arrays that have more rows than fit in memory. Therefore I am looking for find() type function that would do the job. Why is Singapore currently considered to be a dictatorial regime and a multi-party democracy by different publications? interp1 (array, array, <target value>, 'nearest') For example, Z= magic (2) returns a 2-by-2 matrix with random integers between 1 and 4. 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. Just could't explain clearly what I want. Can virent/viret mean "green" in an adjectival sense? Specify three outputs to return the row subscripts, column subscripts, and element values. 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. No problem, by the way the original question you asked is totally irrelevant to your latter comment. Not the answer you're looking for? idxFract = idxAboveVal - ( array( idxAboveVal ) - val ) / ( array( idxAboveVal ) - array( idxAboveVal - 1 ) ); Obviously it would need error checking if idxAboveVal is 1 or empty. find max n number in matlab. But Matrices have 2 dimention so indices represents (x,y), where answer will be little different. If the element is present at multiple positions, the find() function will return multiple values for row and column. Otherwise, the result is sometimes an empty matrix due to floating-point roundoff error. *((x-5). ones and zeros. time, then code generation ends with an error. Asking for help, clarification, or responding to other answers. 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. scalar. Input array, specified as a scalar, vector, matrix, or multidimensional array. 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