Running examples in ‘nls2-Ex.R’ failed
The error most likely occurred in:

> base::assign(".ptime", proc.time(), pos = "CheckExEnv")
> ### Name: nls2
> ### Title: Nonlinear Least Squares with Brute Force
> ### Aliases: nls2
> ### Keywords: nonlinear regression models
> 
> ### ** Examples
> 
> 
> y <- c(44,36,31,39,38,26,37,33,34,48,25,22,44,5,9,13,17,15,21,10,16,22,
+ 13,20,9,15,14,21,23,23,32,29,20,26,31,4,20,25,24,32,23,33,34,23,28,30,10,29,
+ 40,10,8,12,13,14,56,47,44,37,27,17,32,31,26,23,31,34,37,32,26,37,28,38,35,27,
+ 34,35,32,27,22,23,13,28,13,22,45,33,46,37,21,28,38,21,18,21,18,24,18,23,22,
+ 38,40,52,31,38,15,21)
> 
> x <- c(26.22,20.45,128.68,117.24,19.61,295.21,31.83,30.36,13.57,60.47,
+ 205.30,40.21,7.99,1.18,5.40,13.37,4.51,36.61,7.56,10.30,7.29,9.54,6.93,12.60,
+ 2.43,18.89,15.03,14.49,28.46,36.03,38.52,45.16,58.27,67.13,92.33,1.17,
+ 29.52,84.38,87.57,109.08,72.28,66.15,142.27,76.41,105.76,73.47,1.71,305.75,
+ 325.78,3.71,6.48,19.26,3.69,6.27,1689.67,95.23,13.47,8.60,96.00,436.97,
+ 472.78,441.01,467.24,1169.11,1309.10,1905.16,135.92,438.25,526.68,88.88,31.43,
+ 21.22,640.88,14.09,28.91,103.38,178.99,120.76,161.15,137.38,158.31,179.36,
+ 214.36,187.05,140.92,258.42,85.86,47.70,44.09,18.04,127.84,1694.32,34.27,
+ 75.19,54.39,79.88,63.84,82.24,88.23,202.66,148.93,641.76,20.45,145.31,
+ 27.52,30.70)
> 
> ## Example 1
> ## brute force followed by nls optimization
> 
> fo <- y ~ Const + B * (x ^ A)
> 
> # pass our own set of starting values
> # returning result of brute force search as nls object
> st1 <- expand.grid(Const = seq(-100, 100, len = 4), 
+ 	B = seq(-100, 100, len = 4), A = seq(-1, 1, len = 4))
> mod1 <- nls2(fo, start = st1, algorithm = "brute-force")
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in list2env(data, env) : first argument must be a named list
Error in result[[which.min(ss)]] : 
  attempt to select less than one element in get1index
Calls: nls2
Execution halted