Re: [R] select cases from a data.frame or matrix

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From: Peter Dalgaard BSA (p.dalgaard@biostat.ku.dk)
Date: Wed 20 Jun 2001 - 21:56:54 EST 

Message-ID: <x24rtbjreh.fsf@blueberry.kubism.ku.dk>

"Till Baumgaertel" <till.baumgaertel@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@biostat.ku.dk)             FAX: (+45) 35327907
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