How do you find duplicate elements in an array in Matlab?

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  1. function T = isMultiple(A)
  2. % T = isMultiple(A)
  3. % INPUT: A: Numerical or CHAR array of any dimensions.
  4. % OUTPUT: T: TRUE if element occurs multiple times anywhere in the array.
  5. %
  6. % Tested: Matlab 2009a, 2015b(32/64), 2016b, 2018b, Win7/10.
  7. % Author: Jan, Heidelberg, (C) 2021.

How do I find duplicate rows in Matlab?

Use unique() to find the distinct row values. If you end up with fewer rows, there are duplicates. It’ll also give you indexes of one location of each of the distinct values. All the other row indexes are your duplicates.

How do you find unique elements in an array in Matlab?

C = unique( A , setOrder ) returns the unique values of A in a specific order. setOrder can be ‘sorted’ (default) or ‘stable’ . C = unique( A , occurrence ) specifies which indices to return in case of repeated values. occurrence can be ‘first’ (default) or ‘last’ .

How do you find the same number in a matrix in Matlab?

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  1. you can have something like this:
  2. A=[1;1;1;2;2;2;2;3;3;3];
  3. B = unique(A); % which will give you the unique elements of A in array B.
  4. Ncount = histc(A, B); % this willgive the number of occurences of each unique element.
  5. best NS.

How do you repeat an array in MATLAB?

B = repmat( A , n ) returns an array containing n copies of A in the row and column dimensions. The size of B is size(A)*n when A is a matrix. B = repmat( A , r1,…,rN ) specifies a list of scalars, r1,..,rN , that describes how copies of A are arranged in each dimension.

How do you repeat a value in Matlab?

u = repelem( v , n ) , where v is a scalar or vector, returns a vector of repeated elements of v .

  1. If n is a scalar, then each element of v is repeated n times. The length of u is length(v)*n .
  2. If n is a vector, then it must be the same length as v .

How do you find identical matrix?

Two matrices are said to be identical if and only if they satisfy the following conditions:

  1. Both matrices have the same number of rows and columns.
  2. Both matrices have the same corresponding elements.

How do you count unique values in an array?

Count Unique Values

  1. We use the COUNTIF function.
  2. To count the unique values (don’t be overwhelmed), we add the SUM function, 1/, and replace 5 with A1:A6.
  3. Finish by pressing CTRL + SHIFT + ENTER.
  4. The array formula below counts the number of values that occur exactly once.

How do you find the index of an array in MATLAB?

In MATLAB the array indexing starts from 1. To find the index of the element in the array, you can use the find() function. Using the find() function you can find the indices and the element from the array. The find() function returns a vector containing the data.

How do you find the same value in an array?


  1. Declare and initialize an array.
  2. Duplicate elements can be found using two loops. The outer loop will iterate through the array from 0 to length of the array. The outer loop will select an element.
  3. If a match is found which means the duplicate element is found then, display the element.

How do you find the number of elements in an array in Matlab?

Description. n = numel( A ) returns the number of elements, n , in array A , equivalent to prod(size(A)) .