# Plotting circle using angle and radius

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Robin Szabo on 7 Nov 2018
Answered: Aquatris on 7 Nov 2018
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. Aquatris on 7 Nov 2018
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
x = r*cos(q); % cartesian x coordinate
y = r*sin(q); % cartesian y coordinate
plot(x,y)

R2018b

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