allows one to draw a quiver plot or arrows plot over a displayed image of a function in two variables of the form $$fxy= f(x,y)$$. It is based on R routines by Ripley and Hand and illustrated in the addictedtor.org gallery from which our qpy code is based.
Here is an example for the function (or expression) $$fxy= \sin(x) + \cos(y)$$. Here we have the settings xlo=ylo = -2.0, xhi=yhi=2.0 and xby=yby = 0.2. The contour color is gray and the pallette for the image is terrain.colors. Here is the output image.
Note that we have shown a test code to generate quiver plots previously.
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