[R] How do I get just the two last tokens of each string in a vector?

John Kane jrkrideau at yahoo.ca
Fri Jun 26 15:47:32 CEST 2009


I have the feeling that this is a very clumsy way to do it but I think it does what you want.
=================================================================
a <- c(" %L H*L L*H H%", "%L H* H%",  "%L L*H %",   "%L L*H %" )
mylist <- strsplit(a," ")
pick <- function(x) {tail(x,2) }
unlist(pick(mylist)

=================================================================


--- On Fri, 6/26/09, Fredrik Karlsson <dargosch at gmail.com> wrote:

> From: Fredrik Karlsson <dargosch at gmail.com>
> Subject: [R] How do I get just the two last tokens of each string in a vector?
> To: "R-Help List" <r-help at stat.math.ethz.ch>
> Received: Friday, June 26, 2009, 7:21 AM
> Dear list,
> 
> Sorry for asking this very silly question on the list, but
> I seem to
> have made my life complicated by going into string
> manipulation in
> vectors.
> What I need is to get the last part of a sting (the two
> last tokens,
> separated by a space), and of course, this should be done
> for all
> strings in a vector, creating a new vector of exual size.
> 
> So,
> 
> a <- c(" %L H*L L*H H%", "%L H* H%",  "%L L*H
> %",   "%L L*H %" )
> 
> should be made into a vector
> 
>  c(" L*H H%", "H* H%",  "L*H %",   "L*H
> %" )
> 
> I have tried strsplit, but it seems to produce a structure
> I cannot
> get to work in this context. Any ideas on how to solve
> this?
> 
> Thankful for all the help I can get.
> 
> /Fredrik
> 
> 
> -- 
> "Life is like a trumpet - if you don't put anything into
> it, you don't
> get anything out of it."
> 
> ______________________________________________
> R-help at r-project.org
> mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained,
> reproducible code.
> 


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