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3.1.8 plv
While plc, plf, pli, and plfp plot representations of a single valued
function of two variables, the plv command plots a 2D vector at each
of a number of (x,y) points. The vector actually looks more like a
dart  it is an isoceles triangle with a much narrower base than
height, with its altitude equal to the vector (u,v), in both magnitude
and direction, and its centroid at the point (x,y):
Making a good vector plot is very tricky. Not only must you find a
nice looking length scale for your (u,v) vectors  the longest should
be something like the spacing between your (x,y) points  but also
you must sprinkle the (x,y) points themselves rather uniformly
throughout the region of your plot. The time you spend overcoming
these artistic difficulties usually isn't worth the effort.
