how can i get a square wave in matlab ?

I want to plot a periodic square wave in matlab and the period T has to be 3. How can i plot a sqaure wave the repeats itself every (T=3) ? help please and thank you!

Answer 1

[Jos (10584)]

Something like this?

t = linspace(0,20,1000) ;
T = 3 ;
x = sign(sin(2*pi*(1/T)*t)) ;
plot(t,x,'b-')

[Chad Gray]

thank you very much mate