How to randomly divide an M by M region into n sub regions

I what to randomly divide a sqaure region (20 by 20) into 3 portions (not necessary square in shape).

Then randomly deploy points in the 3 regions.

I tried the code below but not getting what i want. I need random divisions (different shapes e.g one portion can be a trapezoid and so on)

m=20;
for i=1:1:m;
   
    n(i)=rand.*0.25.*m;
    b(i)=(0.25 +(0.25).*rand).*m;
     c(i)=(0.5 +(0.25).*rand).*m;

end

 plot (n, '+r')
 hold on
 plot (b, 'ok')
 hold on
 plot (c, 'vg')
 hold off

Please help

The above code gives divisions along horizontal lines

figure 1.

I need something like the above figure 1.

[Walter Roberson]

So like one portion might be inside a lopsided pentagon and the next could be out to an ellipse around it, and the third would be the rest?

[Walter Roberson]

https://en.m.wikipedia.org/wiki/Voronoi_diagram

[Shamsuddeen Abdullahi]

yes

Answer 1

[Image Analyst]

Try voronoi() if you want random points, or superpixels() if you have an image and want some sort of decision-based boundaries.