void frame (frameon, ftick) GRIDOPTS.C Level 1
int frameon = 1 to draw a frame around the axis area. The default is 0, off.
int ftick = 0 for no tick marks around the frame
= 1 to add tick marks around the frame.
frame() allows you to put a box around the axis area. The x and y axes are replotted at their maximum values. frame() must be called before any calls to axis drawing routines.