
pljoin: Draw a line between two points 

DESCRIPTION:

	Joins the point (
	x1, 
	y1) to (
	x2, 
	y2). 

SYNOPSIS:

pljoin(x1, y1, x2, y2)

ARGUMENTS:

    x1 (PLFLT, input) :    x coordinate of first point. 

    y1 (PLFLT, input) :    y coordinate of first point. 

    x2 (PLFLT, input) :    x coordinate of second point. 

    y2 (PLFLT, input) :    y coordinate of second point. 
