On Mon, 21 Nov 2011, William Dunlap wrote:
This is a bug in R: it either should prohibit the
attaching of attributes to things of class "name"
or should make it so that attachment of an attribute
doesn't have such a global effect.
A more direct example of the problem is:
> attributes(quote(some.name))
NULL
> bar <- structure(quote(some.name), someAttribute="someAttribute's value")
> attributes(quote(some.name))
$someAttribute
[1] "someAttribute's value"
I reported a similar problem to R-devel in March of
2010 under the subject line "symbol name caching bug:
attributes get tied to symbol names". The consensus
then seemed to be that prohibiting attributes on things
of class "name" was the way to go.
Yes -- just hasn't risen high enough on anyone's todo list to get done.
Best,
luke
Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com
-----Original Message-----
From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On
Behalf Of Kamil Barton
Sent: Monday, November 21, 2011 8:31 AM
To: r-help@r-project.org
Subject: [R] Weird R's behaviour with a quoted name
Can someone explain why the following happens?
---
:> quote(some.name)
some.name
:> bar <- structure(quote(some.name), class = "foo")
:> quote(some.name)
Error in print(some.name) : object 'some.name' not found
:> bar <- quote(some.name)
:> quote(some.name)
Error in print(some.name) : object 'some.name' not found
:> bar <- as.name("some.name")
:> quote(some.name)
some.name
---
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______________________________________________
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and provide commented, minimal, self-contained, reproducible code.
--
Luke Tierney
Chair, Statistics and Actuarial Science
Ralph E. Wareham Professor of Mathematical Sciences
University of Iowa Phone: 319-335-3386
Department of Statistics and Fax: 319-335-3017
Actuarial Science
241 Schaeffer Hall email: luke-tier...@uiowa.edu
Iowa City, IA 52242 WWW: http://www.stat.uiowa.edu
______________________________________________
R-help@r-project.org mailing list
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
