I have some random signal (for example `sin`

signal) with the time scale.

```
t=0:0.1:2*pi
y=sin(t)
plot(t,y)
```

Now I want to draw this signal on this circle. So the time vector actually becomes an envelope of the circle. Envelope of the circle represents "y = 0" in cartesian coordinate system.

Here is an example of what I expect the output to look like:

Thank in advanced!

Answer:

You need to add "noise" to the radius of the circle, roughly around `r=1`

:

```
th = linspace( 0, 2*pi, N ); %// N samples
noise = rand( 1, N ) * .1; %// random noise in range [0..0.1]
r = 1+noise; %// add noise to r=1
figure;
plot( r.*cos(th), r.*sin(th) ); title('noise on circle');
```

An example plot would look like:

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