What is the size of the value at the given points?
If you have that, you can use that for mapping the color as described in the documentation. Specifically, see the ways in which to set c.
Here, I'm just going to assume that c corresponds to r.
th = linspace(0,2*pi,100);
r = rand(1,100);
sz = 75;
polarscatter(th,r,sz,r,'filled')
