Message-ID: <Pine.SOL.3.91.1010620080452.12820B@godzilla3.acpub.duke.edu>
Date: 2001-06-20T12:05:28Z
From: Rashid Nassar
Subject: select cases from a data.frame or matrix
In-Reply-To: <3B30A741.23872.867E0D@localhost>
Would subset() do what you want? for example,
maleOver40 <- subset(select.data.frame, subset=(sex=="m" | sex== "M") & age > 40)
Rashid Nassar
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,
> till
>
> --
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