## sine wave plot

### aaa (view profile)

on 24 Apr 2012
Latest activity Answered by omphile hahilton

on 3 Mar 2015

### Rick Rosson (view profile)

Hi,

I am having some trouble plotting a sine wave and i'm not sure where i am going wrong.

i have

```t = [0:0.1:2*pi]
a = sin(t);
plot(t,a)
```

this works by itself, but i want to be able to change the frequency. When i run the same code but make the change

```a = sin(2*pi*60*t)
```

the code returns something bad. What am i doing wrong? How can i generate a sin wave with different frequencies?

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### Rick Rosson (view profile)

on 24 Apr 2012

```   %% Time specifications:
Fs = 8000;                   % samples per second
dt = 1/Fs;                   % seconds per sample
StopTime = 0.25;             % seconds
t = (0:dt:StopTime-dt)';     % seconds```
```   %% Sine wave:
Fc = 60;                     % hertz
x = cos(2*pi*Fc*t);```
```   % Plot the signal versus time:
figure;
plot(t,x);
xlabel('time (in seconds)');
title('Signal versus Time');
zoom xon;```

HTH.

Rick

Rajasekaran

on 14 Mar 2013

### omphile hahilton (view profile)

on 3 Mar 2015

I would like to generate the product of 2 sine waves at frequencies 697Hz and 1209Hz and sample them and then generate the spectrum of the signal. then play the sine wave through my soundcard speakers help me..........thanks in advanced