I have been learning about Mathematica over the last few days and until tonight, everything was working well. That, I did something, don't ask me what, but when I know try a simple Plot command all that I get is the x and y axis with each going to 1 on each axes but nothing gets plotted. The graph is empty. I know its not the statement, because I am getting this from a book. When I make a graph the end result is
Out = Graphic
but no function on the graph. I suspect that I change some preference or something but I have no idea of what.
Can anyone help ?