[R] Plot 2-d Polynomial without solving it

[Hao Jiang]

Hi,
I want to plot a polynomial in the form like ax^2 + bxy + cy^2 + dx + ey + f
=0 without solving it(since I may have 3 or 4 dimensional polynomial and
it's really hard to solve). Is there any way  to plot this kind of
polynomial?

Thanks a lot!
Hao 
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