create a function that adds up any single row single column single diagonal left to right in matlab

main.m
function sumValue = sumSingleRowColDiagonal(matrix, index, type)
    % Get the size of the matrix
    [m, n] = size(matrix);
    % Initialize the sum value
    sumValue = 0;
    
    % Check the type parameter
    switch type
        case 'row'
            % Check if the index is valid
            if index > 0 && index <= m
                % Sum the elements in the specified row
                sumValue = sum(matrix(index, :));
            else
                error('Invalid row index');
            end
        case 'column'
            % Check if the index is valid
            if index > 0 && index <= n
                % Sum the elements in the specified column
                sumValue = sum(matrix(:, index));
            else
                error('Invalid column index');
            end
        case 'diagonal'
            % Check if the index is valid
            if index > -(m-1) && index < n
                % Sum the elements in the specified diagonal
                if index >= 0
                    sumValue = sum(diag(matrix, index));
                else
                    sumValue = sum(diag(matrix, abs(index)));
                end
            else
                error('Invalid diagonal index');
            end
        otherwise
            error('Invalid type');
    end
end
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main.m
% Create a sample matrix
matrix = [1 2 3; 4 5 6; 7 8 9];

% Sum the elements in the second row
rowSum = sumSingleRowColDiagonal(matrix, 2, 'row');

% Sum the elements in the third column
colSum = sumSingleRowColDiagonal(matrix, 3, 'column');

% Sum the elements in the main diagonal
diagonalSum = sumSingleRowColDiagonal(matrix, 0, 'diagonal');
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