[R] array to data.frame

Martin Maechler maechler at stat.math.ethz.ch
Sat Apr 26 18:30:22 CEST 2003

    Spencer> Dear Peter:
    Spencer> Does the following not work in certain situations:

    Spencer> A <- array(1:4, dim=c(2,2))
    Spencer> dimnames(A) <- list(NULL, c("a", "b"))
    Spencer> as.data.frame(A)

Of course,  array -> data.frame is trivial for 2-dim arrays aka
matrices.  But Jorge had a 3-dim. array (of a special type,
namely a contingency table!) for which Peter gave the solution.

For most other 3-or-more-dim.arrays, there's no corresponding
data frame structure I can think of.

    Spencer> Or is it deprecated for other reasons?

    Spencer> Thanks,
    Spencer> Spencer Graves

Peter Dalgaard BSA wrote:
> Jorge Magalhães <jmagalhaes at oninetspeed.pt> writes:
>>How i can convert a array in to data.frame structure?
>>For example,
>>dim=c(2,4,6), dimnames=list(grupo=c("I","II"), 
> as.data.frame(as.table(vinteesete))
> (or as.data.frame.table(vinteesete), but with S4 methods coming in it
> is increasingly considered bad style to apply methods to objects that
> are not of the requisite class.)

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