Hello, One approach is:
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)) out <- which(m==1, arr.ind=TRUE) out[order(out[,1]),] Regards, Pascal On 20 November 2013 19:28, Arnaud Michel <michel.arn...@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 > Chargé de mission auprès du DRH > DGDRD-Drh - TA 174/04 > Av Agropolis 34398 Montpellier cedex 5 > tel : 04.67.61.75.38 > fax : 04.67.61.57.87 > port: 06.47.43.55.31 > > > [[alternative HTML version deleted]] > > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > -- Pascal Oettli Project Scientist JAMSTEC Yokohama, Japan ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
