Help with creating a function that contains subplot and then calling the function so that u get a single figure of those subplots.

%% Testing additivity and scaling property of y(t) = 2x(t). In another script when i type " plotlti( 2 * x) " it gives me only one plot.

%% Need help to get 2 plots in one figure.

%plotlti.m : function [ ] = plotlti (T)

%% Additivity Property clf

t1 = -5:0.05:5;

t2 = -5:0.5:5;

% Exp #1:

x1 = u(t1);

x2 = u(t1);

x = plus(x1,x2);

e1a = eval(T);

xlim([-5 5]);

hold on;

% Exp #2:

x = u(t2);

y1 = eval(T);

y2 = y1;

e2a = plus(y1,y2);

hold on;

%%Scaling Property

% Exp #1:

y = u(t1);

e1s = 2 * eval(T);

xlim([-5 5]);

hold on;

% Exp #2:

y = 2 * u(t2);

e2s = eval(T);

hold on;

subplot( 2, 1 ,1);

title( 'Additivity Property');

plot(t1,e1a,'LineWidth', 1.5);

hold on;

plot(t2,e2a, 'or', 'MarkerFaceColor', 'r')

legend ( { 'Experiment#1' , 'Experiment#2'});

ylim([-1,5]);

grid on;

hold off;

subplot( 2, 1 ,2);

title( 'Scaling Property');

plot(t1,e1s,'LineWidth', 1.5);

hold on;

plot(t2, e2s, 'or', 'MarkerFaceColor', 'r')

legend ( { 'Experiment#1' , 'Experiment#2'});

ylim([-1,5]);

grid on;

hold off;

return end

[Image Analyst]

http://www.mathworks.com/matlabcentral/answers/13205-tutorial-how-to-format-your-question-with-markup

I can't even run it. What is u?