Hello, Try the following.
result <- lapply(unique(dataset$ID), function(uid) dataset[dataset$ID == uid, ])
names(result) <- unique(dataset$ID) Hope this helps, Rui Barradas Em 24-06-2013 15:36, matteo escreveu:
Hi guys, I'm a newby, so sorry for the easy question. I have a matrix (459x28) in which a large number of observations are repeated (same placed sampled in different times). One of the columns is refers to the ID of the place of sampling. What I would like is to extract subset matrix for every point of sampling. I can do it manually, e.g. x1<-data.frame(dataset[dataset$ID=="x1",]) but is it possible to write a script and let do it to R? So i got n submatrix of the n ID found in the original columns. Cheers Matteo ______________________________________________ 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.
______________________________________________ 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.
