How to graph a moving plot while keeping another one static

I have to write some code to graphically demonstrate the process of convolution. So far I managed create a shifting square wave that moves from left to right. However whenever I try to add a static square wave and do hold on, the same graph is written over and over again. I understand explaining this through words might be a little confusing so I'll just post screenshots of what I currently have and what I want to achieve as well as my code.

Current output:

Expected Output:

x = linspace(-5, 5, 1000);
ft = rect(x,3);
gt = rect(x,2);
pulse2 = [0 ones(1,200) 0];

figure

ax_1 = subplot(3,1,1);
plot(x,ft)
axis([min(x) max(x)    0 1.5])
title('f(t)')

ax_2 = subplot(3,1,2);
p = plot(x,ft);
hold(ax_2,'on')
title('Graphical Convolution')
for k = 1:numel(x)-numel(pulse2)
    plot(x(k:k+numel(pulse2)-1), pulse2)
    axis([min(x) max(x)    0 1.5])
    drawnow 
end
hold(ax_2,'off')

[M S Zobaer]

how to get "Symbolic Math Toolbox" for free?

thanks

Answer 1

[Devineni Aslesha]

The graph overwriting can be avoided by updating the property 'XData' of the 'plot' function as follows.

pp = plot(x(1:1+numel(pulse2)-1), pulse2);
for k = 1:numel(x)-numel(pulse2)
    pp.XData = (x(k:k+numel(pulse2)-1));
    axis([min(x) max(x)    0 1.5])
    drawnow
end