[R] matrix lists

[Prof Brian D Ripley]

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

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