Adding a new column
As mentioned in the video, data.table does not have to deep copy objects in order to modify them. It can modify objects by reference (inplace) to save memory and runtime using the := operator. When you update a data.table by reference, you don't have to assign the result to a new object as the original data.table is modified directly.
Latihan ini adalah bagian dari kursus
Data Manipulation with data.table in R
Petunjuk latihan
Add a new column duration_hour to batrips by reference, by dividing the duration column by 3600.
Latihan interaktif praktis
Cobalah latihan ini dengan menyelesaikan kode contoh berikut.
# Add a new column, duration_hour
___[, ___ := ___]