R help - Oct 2002 - extracting elements from data.frame using TRUE/FALSE

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Dear List, 
I try to extract elements out of an existing data.frame.
but my following functions only returns a dataframe with nothing in it.
the including function get.hist.s() plots a beautyfied histogram...

any clue?!

get.disag2 <- function(x,y,z) {

# x: dataframe including y as variable
# z: element of variable y in dataframe x

blah <- x[x$z==y, ]

get.hist.s(blah)
}

Thank you for your help

Cheers
- -- 
Stephan Holl

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