Description
The function solves a system of non linear equations with either a Broyden or a full Newton method. It provides line search and trust region global strategies for difficult systems.

Usage
nleqslv(x, fn, jac=NULL,...,
               method = c("Broyden", "Newton"),
               global = c("dbldog", "pwldog", "qline", "gline", "none"),
               xscalm = c("fixed","auto"),
               jacobian=FALSE,
               control = list()
    )
Arguments
x
A list or numeric vector of starting estimates.
fn
A function of x returning the function values.
jac
A function to return the Jacobian for the fn function. If not supplied numerical derivatives will be used.
...

请问你明白了它的返回值是什么意思了吗  也急需知道

这是nleqslv() 的详细介绍，解释的十分仔细，希望能有所帮助。