Message-ID: <75D4ED68-C2EC-11D9-A04C-003065C99468@tuebingen.mpg.de>
Date: 2005-05-12T13:48:02Z
From: Georg Otto
Subject: mget empty strings
Dear R community,
I am a beginner to R and have a question concerning mget, about I could
not find anything in the various documentation.
I have a column in a dataframe x for which I want to get values in y:
mget(x[,1], env=y, ifnotfound=NA)
I receive an error mesage:
Error in mget(x[, 1], env = y, ifnotfound = NA) :
attempt to use zero-length variable name
this is probably due to the fact that some of the values in x[,1] are
empty ("")
I would like to get a "NA" for these values, and the found value for
those where mget finds one. Could anyone tell me how this is done
efficiently?
Thanks a lot in advance!
Georg
P.S. I am in digest mode, cc'ing the answer directly to me would be nice
--
Georg Wilhelm Otto
Max-Planck-Institute for Developmental Biology
Spemannstrasse 35/III
D-72076 Tuebingen Germany
phone: +49-7071-601 401
http://www.eb.tuebingen.mpg.de