Can someone please help with creating a program, that will plot two sinusoidal waveforms (amplitude vs. time) on the same graph. The first waveform specifics is 1V amplitude, and 1kHz freq.; second waveform is 2V amplitude and 2kHz freq.

The program I have created below, doesn't contain any errors once it is ran. However, it does not produce the two sinusoidal waveforms as desired.

t=(0:0.001:1)';

y=sin(2*pi*1000*t)+2*sin(2*pi*2000*t)

rng default;

yn=y+0.5*rand(size(t));

plot(t(1:50), yn(1:50))

"I am fairly new to MATLAB, so Im not sure if the problem lies within my plotting method or time vector." Any help is appreciated, thanks for your time.

Answer 1

[Sebastian Castro]

What you just did adds both the waveforms together before plotting them. Why not try something like:

 t = (0:0.001:1)';
 y1 = sin(2*pi*1000*t); 
 y2 = 2*sin(2*pi*2000*t);

 rng default;

 yn1 = y1 + 0.5*rand(size(t));
 yn2 = y2 + 0.5*rand(size(t));
 plot(t(1:50),yn1(1:50),t(1:50),yn2(1:50))

Also, if you're plotting 1000-2000 Hz frequencies, a time interval of 0.001 wouldn't be enough to capture the right dynamics. Try using a smaller one like 1e-4.

- Sebastian