Dear both,
I have found that names are not treated in the same way in optim() depending on
the optimization method (argument 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? would you consider interesting to have the
names passed to the components value and par?
I’m using R version 3.2.2 (2015-08-14)
Platform: x86_64-apple-darwin13.4.0 (64-bit)
Running under: OS X 10.10.5 (Yosemite)
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
Kind regards, Christophe
---------------------------------------
Christophe Dutang
LMM, UdM, Le Mans, France
web: http://dutangc.free.fr <http://dutangc.free.fr/>
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