Dear both,
I have just found that names are treated in the same way in optim() depending
on the optimization method. The example below shows the difference between the
Brent method and the L-BFGS-B method.
f <- function(x){ y <- x^2;names(y) <-"f(x)";y}
optim(10, f, method="Brent", lower=-1, upper=10)$value
optim(10, f, method="L-BFGS-B", lower=-1, upper=10)$value
z <- 10
names(z) <- "x"
z
optim(z, f, method="Brent", lower=-1, upper=10)$par
optim(z, f, method="L-BFGS-B", lower=-1, upper=10)$par
Do you obtain the same behavior?
I’m using R version 3.2.1 (2015-06-18)
Platform: x86_64-apple-darwin13.4.0 (64-bit)
Running under: OS X 10.9.5 (Mavericks)
locale:
[1] fr_FR.UTF-8/fr_FR.UTF-8/fr_FR.UTF-8/C/fr_FR.UTF-8/fr_FR.UTF-8
attached base packages:
[1] stats graphics grDevices utils datasets methods base
loaded via a namespace (and not attached):
[1] tools_3.2.1
Kind regards, CD
---------------------------------------
Christophe Dutang
LMM, UdM, Le Mans, France
web: http://dutangc.free.fr
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