[R] use of "@" character in variable name
Taylor, Z Todd
todd.taylor at pnl.gov
Fri Mar 27 19:35:22 CET 2009
Camel case will cause database issues, too, at least if you ever
need to move from one db to another--every one seems to have its
own idea whether to preserve case, up-case, or down-case object
names. You may not care if you only use one db and only from R.
Why is a Guinea pig neither a pig nor from Guinea?
> -----Original Message-----
> From: r-help-bounces at r-project.org
> [mailto:r-help-bounces at r-project.org] On Behalf Of Krzysztof
> Sent: Thursday, March 26, 2009 6:32 PM
> To: Mike Miller
> Cc: R-Help List
> Subject: Re: [R] use of "@" character in variable name
> The '@' character is an operator used for accessing slots in
> S4 classes.
> Similarly the '$' character is the operator for accessing
> elements of
> lists, etc...
> Although R allows periods, SQL databases will choke on them.
> LaTeX will
> (sometimes?) choke on underscores, and of course any native R
> will cause problems. My take is that camelBackCapitalization is the
> best practice in naming columns, list elements, variables,
> and functions
> for R.
> Mike Miller wrote:
> > Importing data with a header row using read.delim, one
> variable should
> > be named @5HTT but it is automatically renamed to X.5HTT,
> > because the "@" is either unacceptable or misunderstood.
> I've tried to
> > find out what the rules are on variable names but have been
> > unsuccessful. I'll bet someone here can tell me where to
> look. Maybe
> > it's hidden away in here somewhere:
> > http://cran.r-project.org/doc/manuals/R-data.pdf
> > Thanks in advance.
> > Mike
> > ______________________________________________
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> Krzysztof Sakrejda-Leavitt
> Organismic and Evolutionary Biology
> University of Massachusetts, Amherst
> 319 Morrill Science Center South
> 611 N. Pleasant Street
> Amherst, MA 01003
> work #: 413-325-6555
> email: sakrejda at nsm.umass.edu
> R-help at r-project.org mailing list
> PLEASE do read the posting guide
> and provide commented, minimal, self-contained, reproducible code.
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