MATLAB: How to find if a vector has a repetitive element or not? And its repetition number

elementvector

For example

A=[ 1 3 1 1 2 3 5]

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[a,b] = histc(A,unique(A));
count = a(b)

returns the number of occurences of each element in vector A in array "count".

Best wishes

Torsten.

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MATLAB: Matrix repetition

   out = repmat(M,1,k);

MATLAB: Selecting numbers in matrix that are repeated

Try this:

A = randi(1000, 60, 5);                                 % Create Matrix
[Au,~,ix] = unique(A,'stable');                         % Unique elements in ‘A’
tally = accumarray(ix,1);                               % Number Of Occurrences Of Each
keep = tally > 1;                                       % Keep Indices Of Occurrences > 1
out1 = [Au(keep), tally(keep)];                         % Display Numbers & Occurrences
Ai = ismember(A,out1(:,1));                             % Return Logical Index Of Occurrences > 1
Anew = A .* Ai;                                         % Matrix With ‘Single-Occurrence’ Elements Eliminated

The ‘Anew’ matrix has 0 values for the elements that are not repeated, those that are repeated appear in their expected locations.

If you only want the values of the numbers that aare repeated, and the number of repeats, those are contained in the ‘out1’ matrix.

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Related Solutions

MATLAB: Matrix repetition

MATLAB: Selecting numbers in matrix that are repeated

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