Square wave plot

% generation of square wave

%****************************************

y=0:.001:2;

for j=0:2:12;

x=y;

plot(j,x,'r');

hold on;

end

for k=0:4:12;

x=k+y;

m=2;

plot(x,m,'r')

hold on

end

for k=2:4:12;

x=k+y;

m=0;

plot(x,m,'r');

hold on;

end

hold off

axis([0 12 -0.5 2.5])