Message-ID: <15152.37100.97532.274098@gargle.gargle.HOWL>
Date: 2001-06-20T12:02:52Z
From: Peter Holzer
Subject: select cases from a data.frame or matrix
In-Reply-To: <3B30A741.23872.867E0D@localhost>
Till Baumgaertel 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...
>
maleOver40 <- d[(d$sex == "m" | d$sex == "M") & d$age > 40,]
> thank you,
> till
>
> --
> "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
> tears in rain. Time to die." (Roy)
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