[R] finding roots of multivariate equation

[Bill Shipley]

Hello,
I want to find the roots of an equation in two variables.  I am aware of the
uniroot function, which can do this for a function with a single variable (as I
understand it...) but cannot find a function that does this for an equation
with more than one variable.  I am looking for something implementing similar
to a Newton-Raphson algorithm.
Thanks.

-- 
Bill Shipley
North American Editor for Annals of Botany
Subject Editor for Ecology
Département de biologie
Université de Sherbrooke
Sherbrooke (Québec) J1K 2R9
Canada