hello
here is the correct answer :
T = 25e-3; % signal duration = 25 ms
amplitude = 0.4;
fs = 10000; % ts = 0.1 ms
t = 0:1/fs:T-1/fs;
f_signal = 1/(5e-3 + 0.5e-3); % signal period = 5 ms + 0.5 ms
width = 5e-3/(5e-3 + 0.5e-3); % ratio of time for upward and downward portion of signal
x = amplitude*(0.5*(1+sawtooth(2*pi*f_signal*t,width)));
plot(t*1000,x)
xlabel('time (ms)');
grid on