From cberry@tajo.ucsd.edu  Mon Oct  8 18:43:23 2001
From: cberry@tajo.ucsd.edu (Charles C. Berry)
Date: Mon, 8 Oct 2001 10:43:23 -0700 (PDT)
Subject: [Rd] NA as names of vector from subscripted matrix == bug ?
Message-ID: <Pine.GSO.4.05.10110081028170.7117-100000@tajo.ucsd.edu>



Is this a bug?

> matrix(1:4,nc=2,dimnames=list(1:2,1:2))[c(1,3)]
 1 NA 
 1  3 

It has some annoying consequences, e.g.

> median( matrix(1:9,nc=3,dimnames=list(1:3,1:3))[1,,drop=F] )
NA 
 4 
> 

The above was for 

Version:
 platform = sparc-sun-solaris2.7
 arch = sparc
 os = solaris2.7
 system = sparc, solaris2.7
 status = 
 major = 1
 minor = 3.0
 year = 2001
 month = 06
 day = 22
 language = R


The behavior seems to differ slightly in 1.3.1.

On Windows 1.3.1  

 matrix(1:9,nc=3,dimnames=list(1:3,1:3))[ cbind(1:3,1:3) ]

omits the names (as is my preference).

 
Charles C. Berry                        (858) 534-2098 
                                         Dept of Family/Preventive Medicine
E mailto:cberry@tajo.ucsd.edu	         UC San Diego
http://hacuna.ucsd.edu/members/ccb.html  La Jolla, San Diego 92093-0645

 

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[Rd] NA as names of vector from subscripted matrix == bug ?
Charles C. Berry