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

Till Baumgaertel till.baumgaertel at epost.de
Wed Jun 20 13:38:09 CEST 2001

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
tears in rain. Time to die."              (Roy)
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