R version 2.15.2 Patched (2013-01-16 r61667) -- "Trick or Treat"
Copyright (C) 2013 The R Foundation for Statistical Computing
ISBN 3-900051-07-0
Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit)

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> 
> library(nleqslv)
> 
> f <- function(x) {
+     y <-numeric(length(x))
+     y[1] <- x[1]^2 + x[2]^3
+     y[2] <- x[1] + 2*x[2] + 3
+     y
+ }
> 
> # test named x-values
> xstart <- c(a=1.0, b=0.5)
> xstart
  a   b 
1.0 0.5 
> 
> z <- nleqslv(xstart,f, control=list(trace=0))
> all(names(z$x) == names(xstart))
[1] TRUE
> 
> # test named x-values
> xstart <- c(u=1.0, 0.5)
> xstart
  u     
1.0 0.5 
> 
> z <- nleqslv(xstart,f, control=list(trace=0))
> all(names(z$x) == names(xstart))
[1] TRUE
> 
> proc.time()
   user  system elapsed 
  0.325   0.043   0.363