MATLAB: How to get sub-circles from orignal circle

Question

Hi,

I have circle with diameter 1, I use below code:

meshgrid(x,y)
Fig,surf(x,y,z,'facecolor','interp','edgecolor',none);view(2)
xlim([0 1]),ylim([0 1))
colorbar;colormap(hot);

Now I want plot a circle

figure2. Keep original circle diameter 0-0.39 from bottom as it is, and fill rest of the original area with black color

Figure3: Keep original circle diameter 0.39~1 (up or top) as it is, and fill rest of the original area with black color

Figure4: Keep original circle diameter 0~63 from left as it is, and fill rest of the original area with black color

Figure5: Keep original circel diameter 0.4~1 to right as it is,and fill rest of the original area with black color

Kindly some help to do this.

Answer 1

See this color wheel example. Adapt as needed.