how can I get the square wave in matlab

when the y-axis = 1, -5 < t < -1

when the y-axis = -1, -1 < t < 3

t = linspace(-5, 3, samples+1);
f = square(t);

figure(1)
plot(t, f)

thank you in advance

Answer 1

[Star Strider]

Try this:

samples = 100;
t = linspace(-5, 3, samples+1);
f = 1*((t >= -5) & (t <= -1)) + (-1)*((t > -1) & (t <= 3)); 

figure(1)
plot(t, f)
axis([-5.5  3.5    -1.1  1.1])

EDIT — Changed ‘t’ and axis limits to reflect edited limits (about 04:00 UCT 11 Mar 2018) in original Question.