On Jul 1, 2011, at 4:50 PM, David Winsemius wrote:
>
> I would like to do some operations inside a function using only one value for
> the last dimension of a table/matrix:
>
> tabfn <- function (dfrm, facvec, YN ="event"){
> return( Etbl <- do.call(table, dfrm[ , c(facvec, "event") ]) )
> # just want Etbl[,,,"TRUE"] or Etbl[,, "TRUE"] or Etbl[,"TRUE"]
> }
> tbl <- tabfn(testdf, c("x", "y") )
> tbl # all value of event returned
>
> At the console it is easy for me to count the number of factors and use the
> right number of commas
>
> tbl[ , , "TRUE"] if I only want the slice with that value. How can I do this
> programmatically?
>
> Thnks.
David,
I had a vague recollection of something like this coming up at some point in
the past and it took me a bit to get the right keywords to find it.
I did not realize how far back it was (2001), but here are two possible
solutions by Peter Dalgaard and Thomas Lumley from the same thread:
https://stat.ethz.ch/pipermail/r-help/2001-October/016110.html
https://stat.ethz.ch/pipermail/r-help/2001-October/016122.html
It looks like Peter's solution is along the lines of the one that you just
posted.
Hope that this helps.
Regards,
Marc Schwartz
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