From p.dalgaard at biostat.ku.dk  Tue Dec 13 17:37:36 2005
From: p.dalgaard at biostat.ku.dk (Peter Dalgaard)
Date: 13 Dec 2005 17:37:36 +0100
Subject: [Rd] 0/1 vector for indexing leads to funny behaviour (PR#8389)
In-Reply-To: <20051213150515.175B8A3C7@slim.kubism.ku.dk>
References: <20051213150515.175B8A3C7@slim.kubism.ku.dk>
Message-ID: <x23bkxar73.fsf@viggo.kubism.ku.dk>

rasche at molgen.mpg.de writes:

> Full_Name: Axel Rasche
> Version: 2.2.0
> OS: Linux
> Submission from: (NULL) (141.14.21.81)
> 
> 
> Dear Debuggers,
> 
> This is not a serious problem. Are 0/1 vectors intended to be used as index
> vectors? If yes, there is a bug. If not, it leads just to some funny behaviour
> rather than an error message.
> 
> In the appendix is some simple code to reproduce the problem. A logical vector
> as.logic(a) helps by indexing the vector b. The 0/1 vector a just returns the
> first value "a". But as many times as there is a 1 in a.


Yes, that is completely as intended. Zeros in a numerical index vector
produce nothing and ones produce the first element. The documentation
could arguably be better on this point though.

 
> Best regards,
> Axel
> 
> 
> Appendix:
> 
> b = c("a","b","c","d")
> a = c(0,1,1,0)
> b[as.logical(a)]
> b[a]
> a = c(1,0,1,0)
> b[as.logical(a)]
> b[a]
> a = c(0,1,1,1)
> b[as.logical(a)]
> b[a]
> 
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
> 

-- 
   O__  ---- Peter Dalgaard             ?ster Farimagsgade 5, Entr.B
  c/ /'_ --- Dept. of Biostatistics     PO Box 2099, 1014 Cph. K
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~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)                  FAX: (+45) 35327907



[Rd] 0/1 vector for indexing leads to funny behaviour (PR#8389)
Peter Dalgaard