[R] A matrix of lists?

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R.E. Darnell (R.E.Darnell@newcastle.ac.uk)
30 Nov 1999 11:09:59 +0000 




I tried to construct a matrix of lists e.g.



R> Matlist<-matrix(list(a1=c(1:4),b1=c(1:3),a2=c(1:9),b2=c(1:2)),nrow=2,ncol=2,byrow=F)


Error: Unimplemented feature in copyVector



V&R p52 talk about ragged arrays using a labelling factor. I am not


sure what this means.  Is it that the list indexing can be defined by


two factors (of length 4 in this example) that hold the row and column


indices? How would I reference a subset of list items then  


(Matlist[[Col==2]]  ?)  


Trying something like this gives me



R> Matlist[[Col==2]]


Error: attempt to select more than one element


 



My aim is to have a set of lists that I can refer to using matrix type


indexing  like Matlist[,2] or Matlist[,-1]. 



I appreciate any help



Ross Darnell



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