[R] select cases from a data.frame or matrix
rnassar at duke.edu
Wed Jun 20 14:05:28 CEST 2001
Would subset() do what you want? for example,
maleOver40 <- subset(select.data.frame, subset=(sex=="m" | sex== "M") & age > 40)
On Wed, 20 Jun 2001, Till Baumgaertel wrote:
> Date: Wed, 20 Jun 2001 13:38:09 +0200
> From: Till Baumgaertel <till.baumgaertel at epost.de>
> To: r-help at stat.math.ethz.ch
> Subject: [R] select cases from a data.frame or matrix
> hi all,
> is there a better solution to select rows from a data.frame than by iterating
> through the whole set and evaluating every case one by one?
> is there maybe something like:
> d <- data.frame(...)
> maleOver40 <- select.data.frame( d, "( sex=m or sex=M) and age > 40)")
> of course, i could use direct database-requests, but this would require my data
> to be stored in a database...
> thank you,
> "I have seen things you people wouldn't believe.
> Attack-ships on fire off the shoulder of Orion.
> I watched seabeams glitter in the dark near the
> Tannhauser gate.
> All those moments will be lost in time like
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