[R] Remove double quotation marks

[Barry Rowlingson]

On Tue, Dec 29, 2009 at 6:31 PM, Lisa <lisajca at gmail.com> wrote:
>
> Thank you for your reply. But in the following case, “cat()” or “print()”
> doesn’t work.
>
> data.frame(cbind(variable 1, variable 2, cat(paste("variable", x), "\n"))),
> where x is a random number generated by other R script.
>
> Lisa

 Yes, because you are Doing It Wrong. If you have data that is indexed
by an integer, don't store it in variables called variable1, variable2
etc, because very soon you will be posting a message to R-help that is
covered in the R FAQ...

 Store it in a list:

 v = list()
 v[[1]] = c(1,2,3,4,5)
 v[[2]] = c(4,5,6,7,8,9,9,9)

then you can do v[[i]] for integer values of i.

If you really really must get values of variable by name, perhaps
because someone has given you a data file with variables called
variable1 to variable99, then use the paste() construction together
with the 'get' function:

[ not tested, but should work ]

 > v1="99"
 > v2="102"
 > i=2
 > get(paste("v",i,sep=""))
 [1] 102

Barry