If the flight identifiers runway$Flight and oooi$Flight are unique (i.e. only one observation has the same identifier in each dataset), you could use merge() to bind together the dataset based on matching the two. See,
?merge Also, I see an OnDate variable in both dataset. So if Flight does not provide unique identification, maybe Flight and OnDate together do, which can also be handled in merge. Let us know if that solves the problem. Best, Daniel ------------------------- cuncta stricte discussurus ------------------------- -----Original Message----- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of James Rome Sent: Saturday, March 20, 2010 10:20 AM To: r-help@r-project.org Subject: [R] How to select a row from one dataframe that is "close" to a row in another dataframe I have two data frames of flight data, but they have very different numbers of rows. They come from different sources, so the data are not identical. > names(oooi) [1] "FltOrigDt" "MkdCrrCd" [3] "MkdFltNbr" "DprtTrpnStnCd" [5] "ArrTrpnStnCd" "ActualOutLocalTimestamp" [7] "ActualOffLocal" "ActualOnLocal" [9] "ActualInLocal" "ArrivalGate" [11] "DepartureGate" "Flight" [13] "OnDate" "MinutesIntoDay" [15] "OnHour" "pt" > names(runway) [1] "OnDateTime" "IATA" "ICAO" "Flight" [5] "AircraftType" "Tail" "Arrived" "STA" [9] "Runway" "From.To" "Delay" "OnDate" [13] "MinutesIntoDay" "pt" These sets have several hundred thousand rows. In both sets, pt is a POSIXct for the arrival time (from different sources). They are not identical, but surely should be within an hour of each other (hopefully a lot less), and the Flight fields must be the same. So (abs(runway$pt - oooi$pt) < 3600) & (runway$Flight == oooi$Flight) should pick out the corresponding rows in the two data sets (if there is a match). What I need to do is to take the Runway from runway and insert it into the oooi df for the correct flight. What is the best way to do this in R? Thanks, Jim Rome ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
