Can someone help me explain this code?

I'm self-learning MATLAB so my knowledge is not really good. I have this MATLAB but I couldn't fully understand what each line does. I hope someone can help me explain them? Thanks.

fs = 48000;
f0 = 2000;
t = 0:1/fs:5/f0-1/fs;
x = sin(2*pi*f0*t);
xn = x + 0.1*randn(size(x));
subplot(211);
plot(t,x);
subplot(212);
plot(t,xn);
hold on;

Answer 1

[KSSV]

You can get it yourself, by reading the respective functions documentation.

fs = 48000;     % smapling frequency 
f0 = 2000;      % freqency value 
t = 0:1/fs:5/f0-1/fs;   % make time steps using frequencies 
x = sin(2*pi*f0*t);   % make a signal, it is a sine wave here 
xn = x + 0.1*randn(size(x));   % add some noise which has a nrmal distribution 
subplot(211);  % subplot; this will open a figure with two plot options
plot(t,x);   % plot the signal 
subplot(212);
plot(t,xn);  % plot the signal added with noise 
hold on;

[Trung Hieu Tran]

Thanks KSSV, I'll make sure to read it more to understand

Answer 2

[Cris LaPierre]

Consider going through MATLAB Onramp.

You'll also find the help documentation quite detailed, with accompanying examples.

• colon operator
• sin
• randn
• subplot
• plot
• hold