The PLplot Plotting Library: Programmer's Reference Manual  

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plvect
: Vector plot
Draws a vector plot of the vector
(u
[nx
][ny
],v
[nx
][ny
]).
The scaling factor for the vectors is given by
scale
. A
transformation routine pointed to by pltr
with a pointer pltr_data
for additional data required by the transformation routine
is used to map indices within the array
to the world coordinates. The style of the vector arrow may be set using
plsvect
.

Redacted form: plvect(u, v, scale, pltr, pltr_data)
This function is used in example 22.