Removing duplicates of rows from a matrix (finding and removing combination duplicates)

I have a 12x3 double matrix and I want to identify duplicates of combinations of the same numbers and then produce a matrix containing the rows minus those duplicates (e.g. remove 2 as it is a duplicate of combo 1).

How can I go about this?

Answer 1

[Walter Roberson]

[~, ia] = unique(sort(YourMatrix, 2),'rows', 'stable');
NewMatrix = YourMatrix(ia,:);

Although the sort() changes the order of the columns, I go back to the original for the indexing. So for example if the first row had been [5 3 4] then the first row of output would be [5 3 4]... just in case that was important to you.

[Monica W]

Perfect. Thank you, Walter!