RE: [R] mget empty strings

From: Liaw, Andy <andy_liaw_at_merck.com>
Date: Fri 13 May 2005 - 00:04:14 EST


Here's one way to work around it:

> nm <- c("x", "", "y")
> x <- 10; y <- 20
> myObj <- structure(vector(mode="list", length=length(nm)), names=nm)
> goodNames <- nm[nchar(nm) > 0]

> myObj[goodNames] <- mget(goodNames, .GlobalEnv)
> myObj

$x
[1] 10

[[2]]
NULL $y
[1] 20

Andy

> From: Georg Otto
>
> 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
>
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>
>
>



R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Fri May 13 00:12:27 2005

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