Two or more dimensional root (Zero) finding

Good morning to all,

I should find the zero of a specific function with 
respect to a vector of arguments.
Does it exist something similar in R?

Someone else may pipe up with a better answer, but this is generally
a difficult problem (see _Numerical Recipes_ for discussion).  A
reasonable approach is to search for the minimum of the square
of the function (using optim(), nlmin(), etc.).

  Ben Bolker

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