[R-lang] Re: swapping values without temporary storage

[João Veríssimo]

Perhaps rev() can help?

Maybe something like:

x <- c("a", "b", "c")
c(x[1], rev(x[2:3]))

João
On Tue, 2014-04-15 at 17:52 +0000, Hofmeister, Philip wrote:
> this is probably more appropriate for a general R listserv, but i'm more likely to get an answer i can decipher here. apologies also for what is likely a simple fix, but i can't seem to find the right term or syntax to get this to work without writing ugly code.
> 
> i want to swap values in a vector, e.g. 
> 
> x <- c(1, 2, 3)
> [1] 1 2 3
> 
> and get back 
> 
> 1 3 2 
> 
> i can do this by saving the 2nd or 3rd element of the vector elsewhere, replacing one of the vector elements (x[3] <- x[2]), and then restoring the stored value, but that seems wasteful. surely there is a function like swap() or  std::swap(a, b), but i can't seem to find anything. anyone have any ideas? 
> 
> ph
> 
> 
>