Function/Graphing a function

Graphing a function

You can plot the functions whose arguments and values are numeric. For instance

x:	-3	-2	-1	0	1	2	3
y:	3	2	1	0	1	2	3

maps argument -3 → value 3, -2→2, .., 2→2 and 3→3. If you mark x values on the horizontal axis and go vertically up the height that corresponds to the numerical value of the function, y, for that x, marking a dot for every (x,y) couple, your dots must be located on the red line plotted on the right.

The function defined by the table is discrete and finite. It maps a finite amount of points. There are also continuous functions, the ones whose domain is countable infinite. You cannot use table to define such a function. The analytic form is used in this case, eg. y = x², for a square function.