Ordering rows
Ordering aggregated data is quite a common operation. This can be elegantly accomplished by simply chaining data.table expressions together.
Este exercício faz parte do curso
Data Manipulation with data.table in R
Exercício interativo prático
Experimente este exercício completando este código de exemplo.
# Compute the total trips grouped by start_station and end_station
trips_dec <- batrips[, ___, by = .(___,
___)]
trips_dec