[R] Assigning to a vector while keeping the attributes
ggrothendieck at gmail.com
Mon Feb 9 16:30:14 CET 2009
a <- structure(1:3, x = 3)
b <- "attributes<-"(11:15, attributes(a))
On Mon, Feb 9, 2009 at 7:09 AM, Alon Wasserman <alon.was at gmail.com> wrote:
> I would like to know how to assign values to a whole vector while keeping
> its attributes. For example, say I have
> a <- structure(1:3,x=3)
> and I want to change the values to 2:4. If I do, a <- 2:4, the attribute x
> will be lost. I have a workaround for this case, which is to use subset
> a[1:3] <- 2:4.
> However, what if I want to also change the length of a? Then this workaround
> doesn't work and also assigning into length(a) drops the attributes. More
> severe workarounds (such as keeping the attributes and then reassigning
> them) work, but if there's a simple solution, I'd be happy to use it.
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