[Matlab] Bar with errors

function barWithErrors(x, y, err, legends)
    b = bar(x, y);
    
    hold on
    % Calculate the number of groups and number of bars in each group
    [ngroups,nbars] = size(y);
    % Get the x coordinate of the bars
    xi = nan(nbars, ngroups);
    for i = 1:nbars
        xi(i,:) = b(i).XEndPoints;
    end
    errorbar(xi', y, err,'k','linestyle','none');%Adding the errorbars
    hold off
    
    legend(legends);
end