How to create a polar plot?

Hi All,

I have a signal (a complex tall vector) and I'd like to creat polar plots of it with a line connecting points that are adjacent in time.

the signal is attached and any thoughts on that would be greatly appreciated.

This is what I did so far, but seems something is wrong

x = real(S);
y = imag(S);
rho = sqrt(x.^2+y.^2)
theta = atan(y./x)
polarplot(theta, rho)

and I got this

I don't underestand why is everything in the right half plane.

Answer 1

[David Hill]

load S
x = real(S);
y = imag(S);
rho = sqrt(x.^2+y.^2);
theta = atan2(y,x);%use atan2 (4 quadrant)
polarscatter(theta, rho,'filled','SizeData',10);%I assume you want a scatter plot

[Susan]

Cool! thank you so much for your help!