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How to create a circle with segments of specific colors

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Ole on 3 Mar 2019
Edited: Image Analyst on 3 Mar 2019
I am trying to create an image of a circle with inner and outer radius, that is divided radially in segments. Then I would like to fill the segments with four solid colors (r b y m) that will repeat around the segments with theta. Ideally each different collor segment will subtend different angle.
rInner = 180; % inner radius of the colour ring
rOuter = 200; % outer radius of the colour ring
ncols = 20; % number of colour segments
[x, y] = meshgrid(-rOuter:1:rOuter);
[theta, rho] = cart2pol(x, y);
Here is an example the circle, it should close but it was bad choice of the angles.




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