[R] Re: cannot assign dimnames

[Gabor Grothendieck]

Gabor Grothendieck <ggrothendieck <at> myway.com> writes:

: 
: Dan Bebber <danbebber <at> forestecology.co.uk> writes:
: 
: : Please ignore my earlier message on this topic. I was under the mistaken
: : impression that dimnames() named the dimensions themselves, rather than the
: : indices within the dimensions.
: 
: What you are referring to is done in R by referring to the names of
: the dimnames, as opposed to the dimnames, themselves.  Here is an
: example:
: 
: R> mat <- matrix(1:12,4, dimnames = list(letters[1:4],LETTERS[1:3]))
: R> names(dimnames(mat)) <- c("FirstDim", "SecondDim")
: R> mat
:         SecondDim
: FirstDim A B  C
:        a 1 5  9
:        b 2 6 10
:        c 3 7 11
:        d 4 8 12

Perhaps I should have also mentioned that the above could be done
in a single line like this:

R> mat <- matrix(1:12,4, dimnames = list(FirstDim = letters[1:4], SecondDim = 
LETTERS[1:3]))
R> mat
        SecondDim
FirstDim A B  C
       a 1 5  9
       b 2 6 10
       c 3 7 11
       d 4 8 12