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extracting submatrix from a bigger one

matteo dossena 
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

Thread (12 messages)

matteo dossena extracting submatrix from a bigger one Jun 24 Rui Barradas extracting submatrix from a bigger one Jun 24 matteo dossena extracting submatrix from a bigger one Jun 24 Bert Gunter extracting submatrix from a bigger one Jun 24 Rui Barradas extracting submatrix from a bigger one Jun 24 David Winsemius extracting submatrix from a bigger one Jun 24 David Winsemius extracting submatrix from a bigger one Jun 24 Rui Barradas extracting submatrix from a bigger one Jun 24 Bert Gunter extracting submatrix from a bigger one Jun 24 matteo dossena extracting submatrix from a bigger one Jun 24 Bert Gunter extracting submatrix from a bigger one Jun 24 William Dunlap extracting submatrix from a bigger one Jun 24