[R] extract bits of a character vector
Duncan Murdoch
murdoch at stats.uwo.ca
Thu Oct 23 01:14:01 CEST 2008
On 22/10/2008 5:02 PM, jonas garcia wrote:
> Dear list:
>
>
>
> I have the following problem: From a vector like this:
>
> vec<- c("mud_1999_area_A", "gravel_2004_area_F")
>
>
>
> I would like to get the year in a separate vector, such
>
>
>
> y<- c("1999", "2004")
>
>
>
> I´ve been looking to grep() but I'm not sure how to do this.
You want sub() or gsub(). For example, if the year is always the only
digits in the string, then
gsub("[^[:digit:]]", "", vec)
(which says delete all non-digits).
Duncan Murdoch
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