Getting the sort ordering

I wish I'd known MATLAB had... [Y,I] = SORT(X)

• Sort has two outputs! The second output is the indices of the elements, i.e. the re-ordering vector
• Y is the same as X(I)
• Very handy if you want to sort a matrix by one column [~,I] = SORT(M(:,1)); % sort M by its first column Y = M(I,:);