cloudplot( X, Y, nbins )

CLOUDPLOT plots a colormap histogram

Syntax: [ edgesX,edgesY,count ] = cloudplot( X, Y, nbins )

Example:
X=[sort(randn(10000,1)) ; 0.5*randn(3000,1)-2];
Y=[linspace(0,1,10000)' ; ones(3000,1)*0.8]+0.05*randn(13000,1);
subplot(121)
plot(X,Y,'k.')
axis([-3.5,3.5,-0.05,1.05]), box off
colorbar
subplot(122)
cloudplot( X, Y, 100 );
axis([-3.5,3.5,-0.05,1.05]), box off
colormap(flipud(gray))
colorbar
caxis([0 30])