如题：

function X = IsStrictDiagMatrix(A)

% input: A matrix

% output: The matrix after transformation

    % if the matrix is not a square matrix, return error

    if size(A, 1) ~= size(A, 2)

        error('It is not a square matrix');

    end

    % get the size of A and set the size of X

    % use an array to accord if all the row be set

    N = size(A, 1);

    X = zeros(N, N);

    has_set = zeros(N);

    for i = 1 : N

        % find out the max element in a row

        row_max = max(abs(A(i, : )));

        % if the max element is not larger than sum of others, return error

        if (row_max <= (sum(abs(A(i, : ))) - row_max))

            error('It can not be transformed to strict diagonal dominance matrix');

        end

        % find out the index of max element and set the row j of matrix X

        % accord row j has been set

        for j = 1 : N

           if (abs(A(i, j)) == row_max)

              X(j, : ) = A(i, : );

              has_set(j) = 1;

           end

        end

    end

    % if any hasn't been set, return error

    for i = 1 : N

       if (has_set == 0)

          error('It can not be transformed to strict diagonal dominance matrix');

       end

    end

    % output success

    fprintf('It can be transformed to a strict diagonal dominance matrix: \n');

end