Matrix of Elements of Different Types (was Interfacing pre-existing C++ library from R)
On Mon, 25 Feb 2002, Gabor Grothendieck wrote:
--- Prof Brian D Ripley <ripley at stats.ox.ac.uk> wrote:
A matrix list? R lists are just vectors with elements of different types, and R matrices are just vectors with a dimension attribute.
When I saw the above I tried to create a matrix from a list but could not get it to work: my.lm <- lm( rnorm(10) ~ I(1:10) ) my.list <- list(1, 2, 3, 4, 5, 6, my.lm, my.lm, my.lm) my.mat <- matrix( my.list, nrow=3 ) gives the following error in R 1.4.0 on Windows 2000: Error in matrix(my.list, nrow = 3) : Unimplemented feature in copyVector Is there a way to create a matrix out of elements of different types?
dim(my.list) <- c(3,3) my.list
[,1] [,2] [,3] [1,] "Numeric,1" "Numeric,1" "List,12" [2,] "Numeric,1" "Numeric,1" "List,12" [3,] "Numeric,1" "Numeric,1" "List,12" `R matrices are just vectors with a dimension attribute' should have given you a clue! The matrix() route does work in S.
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 _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._