For the sake of clarity we will color the x points on our flat graph red and the y points green. The x and y values are displayed in the graphing window. We will start x at 2.0 and increase it by 0.2 at each click on Action to generate points on the range of y=sin(x) . If you persist you will see most of the range of the sine function colored in. Admittedly this flat graphing, sometimes called mapping, of the real number line onto itself is pretty far removed from ordinary graphing of the sort we have been discussing. The idea though of a function moving or transforming a point to a different point is at times a useful way to think about functions and will come up again.