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Select and Mutate
hflights[c('ActualElapsedTime','ArrDelay','DepDelay')]
# Equivalently, using dplyr:
select(hflights, ActualElapsedTime, ArrDelay, DepDelay)
# Print out a tbl with the four columns of hflights related to delay
select(hflights, ActualElapsedTime, AirTime, ArrDelay, DepDelay)
# Print out hflights, nothing has changed!
hflights
# Print out the columns Origin up to Cancelled of hflights
select(hflights, Origin:Cancelled)
# Find the most concise way to select: columns Year up to and
# including DayOfWeek, columns ArrDelay up to and including Diverted
# Answer to last question: be concise!
# You may want to examine the order of hflight's column names before you
# begin with names()
names(hflights)
select(hflights, -(DepTime:AirTime))
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