Nothing
options(digits=12)
if(!require("BB"))stop("this test requires package BB.")
if(!require("setRNG"))stop("this test requires 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 chen.f ...\n")
chen.f <- function(x) {
v <- log(x) + exp(x)
f <- (v - sqrt(v^2 + 5e-04))/2
sum (f * f)
}
p0 <- rexp(50)
system.time(ans.spg <- spg(par=p0, fn=chen.f, lower=0))[1]
z <- sum(ans.spg$par)
good <- 61.9720512703
print(z, digits=16)
if(any(abs(good - z) > 1e-7)) stop("BB test chen.f a FAILED")
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