Hey All I have always seeked great advice on this website when I would porgram in C. Unfortunately for one of my classes we have started matlab programming.

Hi All,

For our first college asignment I have to plot 3 sinusoid graphs of 4000 Hz with 25 samples per period. I also have to start from -T. The thing is I have the code. The whole class has the code i just want to understand it better.

If you guys understand this code(which I am confident you do) please break it down for me.

Things I don't understand in the code:

* what is the point of fs

*i dont get how 3 graphs result from this

the x1-x3 functions are defined by our teacher.

Thank you:

code:

Code:f = 22050; %frequency of sinusoids T = 1/f; %period of sinusoids fs = 20/T; %at least 20 samples per period tt = -T:(1/fs):2*T; %3 cycles starts at a negative time equal to -T x1 = 24*cos(2*pi*f*tt+8.8); x2 = 20*cos(2*pi*f*tt+2); x3 = x1+x2; subplot(311); plot(tt, x1), grid on; title('x1'); axis tight subplot(312); plot(tt, x2), grid on; title('x2'); axis tight subplot(313); plot(tt, x3), grid on; title('x3'); xlabel('Time (sec)'); axis tight orient tall