Completing the Solar System
You have been given a data frame (planet_df) from the devstronomy project with the number of moons per planet in our Solar System. However, Mercury and Venus, the two moonless planets, are absent. You want to expand this dataset using the complete() function and a vector planets that contains all eight planet's names.
Questo esercizio fa parte del corso
Reshaping Data with tidyr
Istruzioni dell'esercizio
- Complete the
planetvariable using theplanetsvector. - Replace
NAvalues in then_moonsvariable with0Lvalues.
Esercizio pratico interattivo
Prova a risolvere questo esercizio completando il codice di esempio.
planets = c("Mercury", "Venus", "Earth", "Mars", "Jupiter", "Saturn", "Uranus", "Neptune")
planet_df %>%
complete(
# Complete the planet variable
___,
# Overwrite NA values for n_moons with 0L
___
)