How can I recreate this wave using the sawtooth wave function?

I am trying to recreate this plot in matlab using the sawtooth() function. I have a good start, but I'm having a hard time figuring out where to go from here. Here is what I have started :

T = 3 * 4;
Fs = 1000;
dt = 1/Fs;
t=-5:dt:T-dt; 
x = sawtooth (pi*t  , 0.5); 
plot(t-1,x)
grid on
axis ([-5 5 -1.5 1.5]);

Answer 1

[Michelangelo Ricciulli]

Hi! You just need to slightly modify the function sawtooth, putting a minus sign before it and adding a division by a factor 2 inside :

   x = -sawtooth (pi/2*t, 0.5);