To transform an adjacency matrix

Hi:

which(m == 1L, arr.ind = TRUE)

Dennis

On Wed, Nov 20, 2013 at 2:28 AM, Arnaud Michel <michel.arnaud at cirad.fr> wrote:

Hi
I have the following problem
I would like to build, from a matrix filled with 0 and with 1, a matrix
or a data.frame which contains, in every line, the number of the line
and the number of the column of the matrix for which the value is equal
to 1.
Exemple :

dput(m)
structure(c(0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 1,
0, 0, 0, 1, 0, 0, 0, 0), .Dim = c(5L, 5L))

Result

1 5
2 3
2 4
4 1
4 3

Thank you for your help

--
Michel ARNAUD
Charg? de mission aupr?s du DRH
DGDRD-Drh - TA 174/04
Av Agropolis 34398 Montpellier cedex 5
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fax : 04.67.61.57.87
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