MATLAB: Check if matrix has two identical rows

MATLABmatrixmatrix manipulation

Hi everyone, I wanted to check if a matrix has two identical rows. But i cant create a code that can do that. I was wondering if anyone has any idea on how to do that?

Best Answer

If you want to remove identical rows, then

B = unique(A,'rows');

As a check, if size(B) ~= size(A), then you have at least two identical rows.

Related Solutions

MATLAB: How to match row of two different matrix

ind = ismember(A,B,'rows');
if (~ind)
  A(end+1,:)=B;
end

MATLAB: How can i find identical rows in a matrix

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.

x = [
    1 1
    2 2
    3 3
    4 4
    2 2
    3 3
    3 3
    ];
[u,I,J] = unique(x, 'rows', 'first')
hasDuplicates = size(u,1) < size(x,1)
ixDupRows = setdiff(1:size(x,1), I)
dupRowValues = x(ixDupRows,:)

Best Answer

Related Solutions

MATLAB: How to match row of two different matrix

MATLAB: How can i find identical rows in a matrix

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