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%% Sort Rows of Matrix %% % Start with an arbitrary matrix, |A|. A = floor(gallery('uniformdata',[6 7],0)*100); A(1:4,1) = 95; A(5:6,1) = 76; A(2:4,2) = 7; A(3,3) = 73 %% % Sort the rows of |A|. B = sortrows(A) %% % When called with only a single input argument, |sortrows| bases the sort % on the first column of the matrix. For any rows that have equal elements % in a particular column, (e.g., |A(1:4,1)| for this matrix), sorting is % based on the column immediately to the right, (|A(1:4,2)| in this case). %% % When called with two input arguments, |sortrows| bases the sort entirely % on the column specified in the second argument. % % Sort the rows of |A| based on the values in the second column. C = sortrows(A,2) %% % Rows that have equal elements in the specified column, (e.g., |A(2:4,:)|, % if sorting matrix |A| by column 2) remain in their original order. %% % Specify two columns to sort by: columns 1 and 7. D = sortrows(A,[1 7]) %% % |sortrows| sorts by column 1 first, and then for any rows with equal values % in column 1, sorts by column 7. %% % Sort the rows in descending order using the values in column 4. [E,index] = sortrows(A, -4) %% % The index vector, |index|, describes the rearrangement of the rows, such % that |E = A(index,:)|.