Check for duplicate entries in a large matrix matlab

duplicates, matlab

Solution

With a large matrix `M`, to get all the unique values, use:

uniqueValues = unique(M(:));

Then, to understand if there were any repeated values, you could use:

repeatedValuesFound = numel(uniqueValues) ~= numel(M);

That is, if the array of unique values has the same number of elements as the original array, then all elements of the original array must be unique.

Problem

I have a very large matrix (901x1801) which I generated by combining values of three similar arrays (with repeated values in them) to generate unique codes using a mathematical expression. The matrix is filled with these codes. My question is... How can I check that each values of the matrix (901x1801) is unique and not repeating even a single time? Or... Can anyone tell me how can I generate a matrix by combining three arrays of similar elements in a way that each generated value will be unique. an early reply will be greatly appciable. Thanks in advance.

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