[R] Two or more dimensional root (Zero) finding

[Ben Bolker]

enrico.foscolo2 at libero.it wrote:
> 
> 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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