Look at ?ifelse en ?abs, eg :
data_frame$new_column_in_dataframe - ifelse(stage$julian_day ==
baro$julian_day abs(stage$time -
baro$hour) = 30,
stage$stage.cm - baro$pressure, NA )
Cheers
Joris
On Thu, Jul 1, 2010 at 10:09 PM, Jeana Lee jeana@colorado.edu wrote:
Hello,
I have two
Your question seem to me to be not precise enough for us to provide
help. Do you need help with the if() syntax? If yes I would advice you
to read some introductory R tutorial (like introduction to R (pdf,
freely avalable on the net)) or some descent textbook.
On quick hint for the correct
Hello,
I have two series, one with stream stage measurements every 5 minutes, and
the other with barometric pressure measurements every hour. I want to
subtract each barometric pressure measurement from the 12 stage measurements
closest in time to it (6 stage measurements on either side of the
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