ARROW plots a vector arrow at any desired point and with any desired angle. The type of arrowhead drawn may be selected.
CALL ARROW (x,y,al,a,p,b)
x,y (R): location coordinates for vector-arrow tail
al (R): length of arrow in plot units
if al=0, only a single point at (x,y) is output
a (R): angle from horizontal at which the arrow is to be drawn
(deg counterclockwise)
p (R): length of arrowhead in plot units
> 0 open arrowhead ( --> )
= 0 no arrowhead
< 0 closed arrowhead ( -|> )
b (R): angle between arrowhead side and arrow line (deg)