Dear R-developers
I came across the following issue, which I find strange:
setClass("A", representation(a = "numeric"))
B <- list()
myA <- new("A", a = 1)
B$otherA <- myA
b$oth...@a <- 2
m...@a
Assigning a new value to slot 'a' in the _copy_ of myA stored
in B$otherA changes the original value of myA -- this was
surprising to me, and I believe not supposed to be so. This
"copy-through" only happens once.
b$oth...@a <- 1
m...@a
Other ways to access the list entries (B[["otherB"]] and B[[1]]) seem
to work as expected, and it seems that the issue is related to the fact
that 'otherA' does not already exist in B.
Is there something I have missed? Thanks.
Best, Niels
sessionInfo()
R version 2.12.0 Under development (unstable) (2010-09-13 r52905)
Platform: i386-apple-darwin9.8.0/i386 (32-bit)
locale:
[1] da_DK.UTF-8/da_DK.UTF-8/C/C/da_DK.UTF-8/da_DK.UTF-8
attached base packages:
[1] stats graphics grDevices utils datasets methods base
--
Niels Richard Hansen Web: www.math.ku.dk/~richard
Associate Professor Email: [email protected]
Department of Mathematical Sciences [email protected]
University of Copenhagen Skype: nielsrichardhansen.dk
Universitetsparken 5 Phone: +45 353 20783 (office)
2100 Copenhagen Ø +45 2859 0765 (mobile)
Denmark
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