From mathieu.ribatet at epfl.ch  Wed Apr 22 22:03:05 2009
From: mathieu.ribatet at epfl.ch (Mathieu Ribatet)
Date: Wed, 22 Apr 2009 22:03:05 +0200
Subject: [Rd] 'is.integer' (PR#13671)
In-Reply-To: <20090422174516.2EB1928321BF@mail.pubhealth.ku.dk>
References: <20090422174516.2EB1928321BF@mail.pubhealth.ku.dk>
Message-ID: <1240430585.5090.5.camel@ubuntu>

To the best of my knowledge this is not a bug. According to FAQ 3.3.3
"Numeric constants with no fractional and exponent (i.e., only integer)
part are taken as integer in S-Plus 6.x or later, but as double in R."

You can see it by invoking
>storage.mode(1)
[1] "double"

Hence, if you really want to have integers, you need to use as.integer
i.e.
> storage.mode(as.integer(1))
[1] "integer"

Cheers,
Mathieu

Le mercredi 22 avril 2009 ? 19:45 +0200, hzambran.newsgroups at gmail.com a
?crit :
> Full_Name: Mauricio
> Version: 2.9.0 (2009-04-17)
> OS:  i486-pc-linux-gnu
> Submission from: (NULL) (193.205.203.3)
> 
> 
> This is a very simple function that seems not to be working, according to the
> definition given by '?is.integer'.
> 
> I checked in the Bug Tracking page at http://bugs.R-project.org/, but I didn't
> find any related message.
> 
> The possible problem is:
> 
> 
> > is.integer(1)
> [1] FALSE
> 
> and 1 is obviously an integer value.
> 
> 
> I would really appreciate if you could clarify if this is really a bug or not.
> 
> Thanks in advance,
> 
> Mauricio
> 
> > version
>                _                           
> platform       i486-pc-linux-gnu           
> arch           i486                        
> os             linux-gnu                   
> system         i486, linux-gnu             
> status                                     
> major          2                           
> minor          9.0                         
> year           2009                        
> month          04                          
> day            17                          
> svn rev        48333                       
> language       R                           
> version.string R version 2.9.0 (2009-04-17)
> 
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
-- 
Institute of Mathematics
Ecole Polytechnique F?d?rale de Lausanne
STAT-IMA-FSB-EPFL, Station 8
CH-1015 Lausanne   Switzerland
http://stat.epfl.ch/
Tel: + 41 (0)21 693 7907



[Rd] 'is.integer' (PR#13671)
Mathieu Ribatet