[R] Matrix Dimnames

[Joshua Wiley]

Hi Rookie,

Sure, just use the dimnames argument.  You pass it a list where the
first element contains the row names and the second element contains
the column names.  Supposing you only want to name one dimension, just
use NULL for the other (see ?matrix for full details).

Using your data:

x <- matrix(c(15, 7, 20, 12, 25, 14, 30, 19, 35, 7, 15, 7, 20, 17, 25,
19, 30, 25, 35, 10, 15, 15, 20, 12, 25, 19, 30, 22, 35, 11, 15, 11,
20, 18, 25, 18, 30, 19, 35, 15, 15, 9, 20, 18, 25, 18, 30, 23, 35,
11), nrow=25, byrow=TRUE, dimnames = list(NULL, c("Cotton",
"Observations")))

Cheers,

Josh

On Tue, Aug 17, 2010 at 3:24 PM, Rookie <rookie8823 at gmail.com> wrote:
> Is there a way that I can specify the column names in the matrix function? Currently, below is the way I am doing it.
>
> x <- matrix(c(15, 7, 20, 12, 25, 14, 30, 19, 35, 7, 15, 7, 20, 17, 25, 19, 30, 25, 35, 10, 15, 15, 20, 12, 25, 19, 30, 22, 35, 11, 15, 11, 20, 18, 25, 18, 30, 19, 35, 15, 15, 9, 20, 18, 25, 18, 30, 23, 35, 11), nrow=25, byrow=TRUE)
> colnames(x) <- c("Cotton", "Observations")
> x
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-- 
Joshua Wiley
Ph.D. Student, Health Psychology
University of California, Los Angeles
http://www.joshuawiley.com/