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 at 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.