[R] how to plot implicit functions

Fabrizio Berloco oquark2005 at libero.it
Fri Dec 26 17:44:56 CET 2008

If you are lucky, try draw3d function of maxima:


       enhanced3d   = true,
       palette      = gray,
       surface_hide = true)$

Many times this function fails; this is due to the fact that resolving
non-linear polynomial equations is required in order to plot 3d-graph, and
sometimes machines, with their finite-number idea, are not able to do it.
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