From tlumley at u.washington.edu  Wed Aug 13 17:22:36 2008
From: tlumley at u.washington.edu (Thomas Lumley)
Date: Wed, 13 Aug 2008 08:22:36 -0700 (PDT)
Subject: [Rd] Column name disappears when indexing a single column
 (PR#12532)
In-Reply-To: <20080813032528.24B8E282EFF7@mail.pubhealth.ku.dk>
Message-ID: <Pine.LNX.4.43.0808130822360.4850@hymn13.u.washington.edu>


1. This is not a bug (as you seem to realize), so it should not be sent to r-bugs.

2. You seem to want the drop=FALSE argument to [], as in FAQ 7.5

      -thomas


On Wed, 13 Aug 2008 cherrera at cs.nmsu.edu wrote:

> Good Day,
>  I can understand that after indexing a single column in a matrix, R will return a vector instead of the single column.  However, during the conversion to a vector, the column name is lost.
>  I was wondering if it would be better to have R return a single column matrix (retaining the column name), instead of automatically converting to a vector.  Users could use as.vector() to convert afterwards.
>
> Thanks,
> CMHJ
> <<insert bug report here>>
>
>
>
> --please do not edit the information below--
>
> Version:
> platform = x86_64-unknown-linux-gnu
> arch = x86_64
> os = linux-gnu
> system = x86_64, linux-gnu
> status =
> major = 2
> minor = 7.1
> year = 2008
> month = 06
> day = 23
> svn rev = 45970
> language = R
> version.string = R version 2.7.1 (2008-06-23)
>
> Locale:
> LC_CTYPE=en_US.UTF-8;LC_NUMERIC=C;LC_TIME=en_US.UTF-8;LC_COLLATE=en_US.UTF-8;LC_MONETARY=C;LC_MESSAGES=en_US.UTF-8;LC_PAPER=en_US.UTF-8;LC_NAME=C;LC_ADDRESS=C;LC_TELEPHONE=C;LC_MEASUREMENT=en_US.UTF-8;LC_IDENTIFICATION=C
>
> Search Path:
> .GlobalEnv, package:stats, package:graphics, package:grDevices, package:utils, package:datasets, package:methods, Autoloads, package:base
>
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
>

Thomas Lumley			Assoc. Professor, Biostatistics
tlumley at u.washington.edu	University of Washington, Seattle



[Rd] Column name disappears when indexing a single column (PR#12532)
Thomas Lumley