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library(data.table)
## -------------------------------------------------------------------------
## data.table + dplyr code now lives in dtplyr.
## Please library(dtplyr)!
## -------------------------------------------------------------------------
##
## Attaching package: 'data.table'
## The following objects are masked from 'package:dplyr':
##
## between, last
flights = fread("flights.csv")
airports = fread("airports.csv")
planes = fread("planes.csv")
weather = fread("weather.csv")
## Warning in fread("weather.csv"): Bumped column 14 to type character on
## data row 73, field contains '""'. Coercing previously read values in this
## column from logical, integer or numeric back to character which may not
## be lossless; e.g., if '00' and '000' occurred before they will now be just
## '0', and there may be inconsistencies with treatment of ',,' and ',NA,' too
## (if they occurred in this column before the bump). If this matters please
## rerun and set 'colClasses' to 'character' for this column. Please note
## that column type detection uses the first 5 rows, the middle 5 rows and the
## last 5 rows, so hopefully this message should be very rare. If reporting to
## datatable-help, please rerun and include the output from verbose=TRUE.
— .class #id