Message-ID: <x24rtbjreh.fsf@blueberry.kubism.ku.dk>
Date: 2001-06-20T11:56:54Z
From: Peter Dalgaard
Subject: select cases from a data.frame or matrix
In-Reply-To: "Till Baumgaertel"'s message of "Wed, 20 Jun 2001 13:38:09 +0200"
"Till Baumgaertel" <till.baumgaertel at epost.de> writes:
> 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,
> till
subset(d, sex %in% c("m","M") & age > 40)
--
O__ ---- Peter Dalgaard Blegdamsvej 3
c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907
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