Hi,
Maybe it's just me but I don't understand what you're trying to do.
Isn't maxValues what you need?
Providing a reproducible example with your data (using the function
dput), the desired output, and the code you've tried would really help!
Ivan
Le 5/18/2010 10:58, Tim Van den Bulcke a écrit :
Hi,
I'd like to select one row in a data frame per subset which is maximal for a
particular value. I'm pretty close to the solution in the sense that I can
easily select the maximal values per subset using "aggregate", but I can't
really figure out how to select the rows in the original data frame that are
associated with these maximal values.
library(stats)
# this returns the list with maximal values for breaks per wool/tension
subset
maxValues = aggregate(warpbreaks$breaks, list(wool = wool, tension =
tension), max)
# now i'd like the subset of the rows in warpbreaks that are associated with
these maximal values
Thank you in advance!
Tim.
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Ivan CALANDRA
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