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 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-devel mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-devel-request@stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._