[Rd] names treatment in optim()

[Christophe Dutang]

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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