plotting unit step function

Hi am trying to plot this unit step function u(t-1)-u(t-2)+u(2-t)-u(3-t)+u(t-3)-u(t-4) and really not sure where to start. I have tried doing a laplace transformations with no success, and setting boundary limits with nothing but errors and have even tried to use heaviside function.

Thank you

Answer 1

[Rick Rosson]

   Fs = 100;
   dt = 1/Fs;
   StartTime = -5;
   StopTime = 15;
   t = StartTime:dt:StopTime-dt;

   x = (t>1) - (t>2) + (t<2) - (t<3) + (t>3) - (t>4);

   figure;
   stairs(t,x);
   ylim([-1.2 1.2]);

Answer 2

[Richard Brown]

Or as an anonymous function:

f = @(t) (t > 1) - (t > 2) + (t < 2) - (t < 3) + (t > 3) - (t > 4);
t = linspace(-5, 5, 200);
stairs(t, f(t));