The PLplot Plotting Library: Programmer's Reference Manual  

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plpath
: Draw a line between two points, accounting
for coordinate transforms.
Joins the point (x1
,
y1
) to
(x2
,
y2
). If a global coordinate transform
is defined then the line is broken in to
n
segments to approximate the
path. If no transform is defined then this simply acts like a call to
pljoin
.

Redacted form: plpath(n,x1,y1,x2,y2)
This function is not used in any examples.