[R] combining strings

[Joshua Wiley]

Hi,

You did not specify what assumptions you can make about xf and xg
(such as will they have identical lengths and is it possible both
could contain nonmissing values in the same element?), but this seems
a straightforward approach in your little example:

index <- is.na(xf)
xf[index] <- xg[index]

HTH,

Josh

On Thu, Jun 16, 2011 at 6:59 PM, Erin Hodgess <erinm.hodgess at gmail.com> wrote:
> 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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-- 
Joshua Wiley
Ph.D. Student, Health Psychology
University of California, Los Angeles
http://www.joshuawiley.com/