[R] combining strings

[David L Carlson]

You don't say what happens if both arrays have non-missing entries, but
assuming that doesn't happen:

> ifelse(is.na(xf),xg,xf)
 [1] "W" "k" "h" NA  "g" "r" "j" NA  "v" "d" NA  "v" NA  "z" "r" "r" "i"

----------------------------------------------
David L Carlson
Associate Professor of Anthropology
Texas A&M University
College Station, TX 77843-4352

-----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 8:59 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

______________________________________________
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.