Add line to a matlab plot

Add_Lines_to_Plot

%%
% This is an example of how to add lines to a plot in MATLAB®.
% 
% Read about the <http://www.mathworks.com/help/matlab/ref/line.html |line|> function in the MATLAB® documentation.
%
% Go to <http://www.mathworks.com/discovery/gallery.html MATLAB Plot Gallery>
%
% Copyright 2012 The MathWorks, Inc.

% Load the step response data
load stepResponse step_data;

% Plot the step response
figure;
plot(step_data(:,1), step_data(:,2), 'r*-');

% Set the axis limits
axis([0 200 0 1.2]);

% Add a title and axis labels
title('Closed loop response');
xlabel('Time');
ylabel('Tank temperature (normalized)');

% Add a horizontal line for the Temperature at steady state
line('XData', [0 200], 'YData', [1 1], 'LineStyle', '-', ...
    'LineWidth', 2, 'Color','m');

% Add lines for the temperature at time = 25
x = 25;
y = (step_data(4,2) - step_data(3,2));
line('XData', [x x 0], 'YData', [0 y y], 'LineWidth', 2, ...
    'LineStyle', '-.', 'Color', [0 0.6 0]);

% Add lines for the temperature at time = 60
x = 50;
y = step_data(6,2);
line('XData', [x x 0], 'YData', [0 y y], 'LineWidth', 2, ...
    'LineStyle', '-.', 'Color', [0.2 0.4 1.0]);