[R] combining strings

[Greg Snow]

What do you want to happen when both are NA? what do you want to happen if both have values?

-- 
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow at imail.org
801.408.8111


> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of Erin Hodgess
> Sent: Thursday, June 16, 2011 7:59 PM
> To: R help
> Subject: [R] combining strings
> 
> Dear R People:
> 
> Suppose I have the following two character vectors:
> 
>  xf
>  [1] "W" NA  NA  NA  NA  NA  NA  NA  NA  NA  NA  NA  NA  NA  NA  NA  NA
> > xg
>  [1] NA  "k" "h" NA  "g" "r" "j" NA  "v" "d" NA  "v" NA  "z" "r" "r"
> "i"
> >
> 
> I want to end up with
> 
> "W" "k" "h" ...
> 
> What is the best way to achieve this, please?  I was thinking that if
> there is an exclusive "or" that it might work.  I've tried all kinds
> of ifs, and ifelse, to no avail.
> 
> 
> Thanks,
> 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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