Casting multiple columns
The data table from the previous exercise, gdp_oceania, is available in your workspace. Your goal is to create a wide format data table, splitting both the "gdp" and "population" columns by the "year" column.
This exercise is part of the course
Joining Data with data.table in R
Hands-on interactive exercise
Have a go at this exercise by completing this sample code.
# Split the gdp and population columns by year
___(gdp_oceania, formula = ___, value.var = ___)