R Under development (unstable) (2026-02-18 r89435 ucrt) -- "Unsuffered Consequences"
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> if(!require("BB"))stop("this test requires package BB.")
Loading required package: BB
> if(!require("setRNG"))stop("this test requires setRNG.")
Loading required package: setRNG
> 
> # Use a preset seed so test values are reproducable. 
> test.rng <- list(kind="Mersenne-Twister", normal.kind="Inversion", seed=1234)
> old.seed <- setRNG(test.rng)
> 
> 
> broydt <- function(x) {
+ n <- length(x)
+ f <- rep(NA, n)
+ #h <- 0.5
+ h <- 2
+ f[1] <- ((3 - h*x[1]) * x[1]) - 2*x[2] + 1
+ tnm1 <- 2:(n-1)
+ f[tnm1] <- ((3 - h*x[tnm1]) * x[tnm1]) - x[tnm1-1] - 2*x[tnm1+1] + 1
+ f[n] <- ((3 - h*x[n]) * x[n]) - x[n-1] + 1
+ f
+ }
> 
> 
> p0 <- rnorm(50)
> ans.opt <- BBsolve(par=p0, fn=broydt)  # note that the default doesn't work generally.
  Successful convergence.
> 
> ans.opt$convergence
[1] 0
>  
> z <- sum(ans.opt$par)
> #good   <-  -352.9190956497645 
> good   <-  -34.72104 
> #on Windows 
> #on Linux64 
> #on Linux32  -352.9190956497645
> print(z, digits=16)
[1] -34.72104372934071
> if(any(abs(good - z) > 5e-1)) stop("BB test BBsolve FAILED")
> 
> proc.time()
   user  system elapsed 
   0.20    0.04    0.21