scatter plot with different colours

i have two vectors and i have a scatter plot of them. u and z are vectors from which i have taken the values

 randIndex = randperm(numel(u));
 randIndex = randIndex(1:5000);
 uRand = u(randIndex);
 zRand = z(randIndex); 
 corrcoef(uRand,zRand)   
 scatter(uRand,zRand)

now what i want to do is that i want x with a different colour and y as a different colour so that both of the vector points are distinguishable. How should i do it . Can somebody help??

[dpb]

Not 'til can figure out what it is that you're trying to distinguish, precisely, no... :)

Who's x and y, precisely, and what distinguishes them on the plot? You've got one point at each coordinate and each of those points is from a particular point in the corresponding vector for the abscissa/ordinate--what's to distinguish one from the next?