[Rd] (no subject)

[stefano iacus]

Apologizies, I forgot the subject.
Btw, I found it
stefano

Il giorno 01/feb/06, alle ore 18:25, stefano iacus ha scritto:

> Suppose X is a data.frame with n obs and k vars, all variables are
> factors.
>
> tab <- table(X)
>
> containes a k-dim array
>
> I would like to get a list from tab. This list is such that, each
> element contain the indexes corresponding to the observations which
> are in the same cell of this k-dim array. Of course, only for non
> empty cell.
>
> E.g.
>
>> set.seed(123)
>> X <- as.data.frame(matrix(rnorm(5000),100,5))
>> X$V1 <- cut(X$V1, br=5)
>> X$V2 <- cut(X$V2, br=5)
>> X$V3 <- cut(X$V3, br=5)
>> X$V4 <- cut(X$V4, br=5)
>> X$V5 <- cut(X$V5, br=5)
>> tab <- table(X)
>> which(tab>0) -> cells
>> length(cells)
> [1] 94
>
> thus, of course, 94 cells over 5^5 = 3125 are non empty.
> I would like a smart way (without reimplementing table/tabulate) to
> get the list of length 94 which contains the indexes of the obs in
> each cell
> Or, viceversa, a vector of length n which tells, observation by
> observation,  which cell (out of the 3125) the observation is in.
> stefano
>
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