matrix lists
On Tue, 26 Feb 2002, Prof Brian D Ripley wrote:
Perhaps the following example will help demonstrate that matrix lists do exist and do work up to a point, despite strident assertions on R-help to the contrary:
m <- list(a1=1:3, a2=4:6, a3=pi, a4=c("a","b","c"))
dim(m) <- c(2,2)
m
[,1] [,2] [1,] "Numeric,3" "Numeric,1" [2,] "Numeric,3" "Character,3"
is.matrix(m)
[1] TRUE
m[[1,2]]
[1] 3.141593
m[[2,2]]
[1] "a" "b" "c" In S m[2,2] extracts a sub-list, but that seems not to work correctly in R: neither does m[,2]. I am reporting that as a bug.
The bug is now fixed in R-devel, which should make these more useful.
Brian D. Ripley, ripley at 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-help 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-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._