How to generate a sine curve?

I want to generate a sine curve with a frequency of 1 Hz, amplitude of 0.2, and for a time of 15 seconds. I want the sampling rate to be 30 samples per second. This is something that I have so far:

Amp = 0.20;                     
Freq = 1;                       

Time.Val = [0:482-1];

Sig = Amp*...
    sin(Freq*2*pi*Time.Val);

However, I keep getting an error. Can anyone help?

[Matt J]

You forgot to copy/paste your error messages for us, but it probably has to do with AMP.Mod.Time. You should show us how that's generated, too.

[per isakson]

Whit does AMP.Mod.Time stand for? Is it defined?

[Sarah]

Sorry everyone, AMP.Mod.Time should just be Time.Val. I am not actually getting an error, but my plot is weird, I am not getting 1 cycle per second, where each cycle has 30 samples.

[Youssef Khmou]

hi Sarah; you get one period because the time axis is not sampling with F=30Hz; beside you code does nt respect Nyquist condition

Answer 1

[Youssef Khmou]

hi, try :

 Fs=30;
 t=0:1/Fs:15-1/Fs;
 Amp=0.5;
 F=1;
 x=Amp*sin(2*pi*t*F);
 figure, plot(t,x)

[Sarah]

Thank you!