R Under development (unstable) (2026-02-10 r89394 ucrt) -- "Unsuffered Consequences"
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> options(digits=12)
> 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="Wichmann-Hill", normal.kind="Box-Muller", seed=c(979,1479,1542))
> old.seed <- setRNG(test.rng)
> 
> 
> ##########
> cat("BB test valley.f ...\n")
BB test valley.f ...
> 
> valley.f <- function(x) {
+ c1 <- 1.003344481605351
+ c2 <- -3.344481605351171e-03
+ n <- length(x)
+ f <- rep(NA, n)
+ j <- 3 * (1:(n/3))
+ jm2 <- j - 2
+ jm1 <- j - 1
+ f[jm2] <- (c2 * x[jm2]^3 + c1 * x[jm2]) * exp(-(x[jm2]^2)/100) - 1
+ f[jm1] <- 10 * (sin(x[jm2]) - x[jm1])
+ f[j] <- 10 * (cos(x[jm2]) - x[j])
+ sum(f*f)
+ }
> 
> p0 <- rnorm(99, sd=1)
> system.time(ans.spg <- spg(par=p0, fn=valley.f))[1]
iter:  0  f-value:  9967.85170926  pgrad:  656.882748444 
iter:  10  f-value:  70.8329753432  pgrad:  38.1635148017 
iter:  20  f-value:  49.7999877152  pgrad:  2.31315716803 
iter:  30  f-value:  37.1875050208  pgrad:  2.11890224477 
iter:  40  f-value:  28.8169253808  pgrad:  15.1382670666 
iter:  50  f-value:  16.6431333381  pgrad:  6.58130371534 
iter:  60  f-value:  8.01853564457  pgrad:  1.08655232367 
iter:  70  f-value:  5.39677149601  pgrad:  0.853708028714 
iter:  80  f-value:  7.31492770889  pgrad:  22.820945782 
iter:  90  f-value:  1.36200242689  pgrad:  0.437655365282 
iter:  100  f-value:  1.02313867277  pgrad:  1.25082588287 
iter:  110  f-value:  0.369576076528  pgrad:  1.99035298631 
iter:  120  f-value:  0.259117056716  pgrad:  0.174611229364 
iter:  130  f-value:  0.108703289048  pgrad:  1.5601972092 
iter:  140  f-value:  0.0561214415482  pgrad:  0.101029451541 
iter:  150  f-value:  0.0510989687577  pgrad:  0.0974422624533 
iter:  160  f-value:  0.0435229175986  pgrad:  0.0710234288742 
iter:  170  f-value:  0.0257392592413  pgrad:  0.749106419569 
iter:  180  f-value:  0.00893481418644  pgrad:  0.031727185254 
iter:  190  f-value:  0.000951427174107  pgrad:  0.202438952306 
iter:  200  f-value:  0.000273549702574  pgrad:  0.0148989398954 
iter:  210  f-value:  0.000186402219683  pgrad:  0.00544517631587 
iter:  220  f-value:  0.00014730082458  pgrad:  0.00637902101611 
iter:  230  f-value:  4.87734092491e-05  pgrad:  0.0471501294873 
iter:  240  f-value:  6.93859080698e-06  pgrad:  0.000849939058233 
user.self 
     0.53 
>  
> z <- sum(ans.spg$par)
> good   <-   78.8339837886
> print(z, digits=16)
[1] 78.83412268127022
> if(any(abs(good - z) > 1e-2)) stop("BB test valley.f b FAILED")
>  
> 
> proc.time()
   user  system elapsed 
   0.68    0.18    0.85