From ripley@stats.ox.ac.uk  Sun Sep 16 12:11:39 2001
From: ripley@stats.ox.ac.uk (ripley@stats.ox.ac.uk)
Date: Sun, 16 Sep 2001 13:11:39 +0200 (MET DST)
Subject: [Rd] rowsum dimnames (PR#1092)
Message-ID: <200109161111.NAA22091@pubhealth.ku.dk>

On Fri, 14 Sep 2001 brahm@alum.mit.edu wrote:

> The result of rowsum() in R doesn't have the dimnames I'd expect, e.g.:
>
> > rowsum(matrix(1:12, 3,4), c("Y","X","Y"))
>     [,1] [,2] [,3] [,4]
>   1    2    5    8   11
>   2    4   10   16   22
>
> whereas S-Plus gives the more useful result:
>     [,1] [,2] [,3] [,4]
>   X    2    5    8   11
>   Y    4   10   16   22
>
> This is because R's rowsum() code gives the first dimnames as "ugroup", which
> is a factor, rather than "as.character(ugroup)".  Similarly for the assignment
> of names(x) in the case where x is a vector.
>
> I'm using R 1.3.0 on Solaris 2.6.  Help says rowsum's author is Terry Therneau.
> Thanks!
> 			-- David Brahm (a215020@agate.fmr.com)

Change a couple of lines to

	dimnames(new.x) <- list(as.character(ugroup), colnames(x))
	names(new.x) <- as.character(ugroup)

(as you seem to be aware).

Done in the sources for 1.4.0.


-- 
Brian D. Ripley,                  ripley@stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595


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[Rd] rowsum dimnames (PR#1092)
ripley@stats.ox.ac.uk