Is there an easy-to-use contour plot function analogous to scatterplot3d that can draw handle a dataset of arbitrary (x,y,z) triplets? That is, say x, y, and z are each measured quanties, and exhibit neither order nor regularity.
I looked at the lattice package function "contourplot" but it seems complicated, and it's not clear from the documentation whether it can handle arbitrary (x,y) values. I'm looking for something like the base package "contour" function that does not make any assumptions about (x,y,z).
Thanks,
Ronnen.
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