Does anyone know of a simple, easy to use, program (freeware or otherwise, but preferable the former) for plotting [line] graphs? I am seeking a program into which I can enter an equation (or two of them for a combined graph) and then it does the rest! Ideally it will be a program that does not require me to learn a special language in order to communicate with it. A program that will allow me to enter into it a formula as formulæ is normally expressed. Thanks.