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matrix to list

3 messages · Pinder, Adrian, Hadley Wickham, Henrique Dallazuanna

Pinder, Adrian
# 
Hi, can someone please tell me how to convert a square matrix to a list in R?

i.e. I want to convert from:

        a       b       c
a       1       1       1
b       2       2       2
c       3       3       3

to:

a       a       1
a       b       1
a       c       1
b       a       2
b       b       2
b       c       2
c       a       3
c       b       3
c       c       3


Thanks,
Adrian.


Adrian Pinder
Senior Research Scientist
Wetland Research
Dept. Environment and Conservation
P.O. Box 51 Wanneroo 6946
Western Australia
adrian.pinder at dec.wa.gov.au (W)
apnlp1 at optusnet.com.au (H)
http://www.naturebase.net/content/view/2475/1338/
ph (61) 08 94055153, fax (61) 08 93061641
mob. 0438 935 932



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Hadley Wickham
# 
On Wed, Sep 17, 2008 at 8:52 PM, Pinder, Adrian
<Adrian.Pinder at dec.wa.gov.au> wrote:
Try melt from the reshape package.

Hadley
Henrique Dallazuanna
# 
Try this:

m <- matrix(rep(1:3, 3), 3, dimnames = list(letters[1:3], letters[1:3]))
as.data.frame.table(t(m))

On Wed, Sep 17, 2008 at 10:52 PM, Pinder, Adrian
<Adrian.Pinder at dec.wa.gov.au> wrote: