how to right math functions

how can I define u(t) for the domain of t. To put in in M-file

[Torsten]

u or u' ?

[Abdulelah AlQahtani]

u'

Answer 1

[Torsten]

us = @(t) 4*(t>=0 & t<5) + 2*(t>=5);
t = -10:0.1:10;
plot(t,us(t),'r')

Answer 2

[Sam Chak]

Hi @Abdulelah AlQahtani

For simplicity, the signal can be defined like this.

t  = linspace(-5, 10, 15001);
u1 = 0*(t <= 0);
u2 = 4*(t > 0 & t <= 5);
u3 = 2*(t > 5);
u  = u1 + u2 + u3;
plot(t, u), grid on, ylim([-0.5 4.5])