MATLAB - Plot multiple data sets on a scatter plot

I have two sets of data, (Ax, Ay; Bx, By). I'd like to plot both of these data sets on a scatter plot with different colors, but I can't seem to get it to work, because it seems scatter() does not work like plot(). Is it possible to do this?

I've tried...

scatter(Ax, Ay, 'g', Bx, By, 'b')

And

scatter(Ax, Ay, 'g')
scatter(Bx, By, 'b')

The first way returns an error. The latter only plots the Bx/By data.