Function: plot
Class: highlevel
Section: graphic
C-Name: plot
Prototype: vV=GGIDGDGp
Help: plot(X=a,b,expr,{ymin},{ymax}): crude plot of expression expr, X goes
 from a to b, with Y ranging from ymin to ymax. If ymin (resp. ymax) is not
 given, the minima (resp. the maxima) of the expression is used instead

