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Ordering rows

Ordering aggregated data is quite a common operation. This can be elegantly accomplished by simply chaining data.table expressions together.

This exercise is part of the course

Data Manipulation with data.table in R

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Hands-on interactive exercise

Have a go at this exercise by completing this sample code.

# Compute the total trips grouped by start_station and end_station
trips_dec <- batrips[, ___, by = .(___, 
                                  ___)]
trips_dec
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