Do variables exist?
If R cannot find a variable in the current environment, it will look in the parent environment, then the grandparent environment, and so on until it finds it.
rsa_env has been modified so it includes capitals and national_parks, but not population.
Questo esercizio fa parte del corso
Introduction to Writing Functions in R
Istruzioni dell'esercizio
- Check if
populationexists inrsa_env, using default inheritance rules. - Check if
populationexists inrsa_env, ignoring inheritance.
Esercizio pratico interattivo
Prova a risolvere questo esercizio completando il codice di esempio.
# Compare the contents of the global environment and rsa_env
ls.str(globalenv())
ls.str(rsa_env)
# Does population exist in rsa_env?
___("___", envir = ___)
# Does population exist in rsa_env, ignoring inheritance?
___