[R] substring/strsplit question
Gabor Grothendieck
ggrothendieck at gmail.com
Thu Oct 30 00:44:54 CET 2008
Assuming that by elements you mean characters ("2E" is the first
element of x but "E" is the last character in x[1]) then this will
create a character matrix of dimensions: length(x) by 2
such that each row corresponds to one component of x
and the second column in that row holds its last character
while the first column in that row holds a string of the prior
characters.
> x <- c("2E","5W","12H")
> library(gsubfn)
> strapply(x, "(.+)(.)$", c, simplify = rbind)
[,1] [,2]
[1,] "2" "E"
[2,] "5" "W"
[3,] "12" "H"
The above assumes the latest version of gsubfn
on CRAN.
On Wed, Oct 29, 2008 at 4:57 PM, Erin Hodgess <erinm.hodgess at gmail.com> wrote:
> Dear R People:
>
> Here is a toy example:
>
>> x <- c("2E","5W","12H")
>> substr(x,2,2)
> [1] "E" "W" "2"
>>
>
> Sometimes x has 3 elements, sometimes 2. I want to extract the last
> element, and then extract the other 1 or 2 elements.
>
> How can I do this, please?
>
> TIA,
> Sincerely,
> Erin
>
>
> --
> Erin Hodgess
> Associate Professor
> Department of Computer and Mathematical Sciences
> University of Houston - Downtown
> mailto: erinm.hodgess at gmail.com
>
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