Plotting circle using angle and radius

I have some code in which I have generated a set of radii and their corresponding angles and I need to plot these as a circle. Unfortunately it creates half the circle twice and I can't find a way to plot the left (negative) side of the circle.

The picture below shows what matlab plots. I decreased the resolution to make it more blocky and so there's definitely two lines however they are both in the positive part of the circle.

Answer 1

[Aquatris]

Next time, share your code so that we can debug your code. My guess is you angle are from +90 degrees to -90 degrees instead of 0 to 360 degrees.

Here is a simple circle code;

q = 0:0.01:2*pi; % angle 0 to 360 degrees in radian
r = 10;          % radius
x = r*cos(q);    % cartesian x coordinate
y = r*sin(q);    % cartesian y coordinate
plot(x,y)