Novice from Competent
Which of the following cannot be elements in a list?
a) data.frame
b) matrix
c) function
d) list
e) none of the above
Competent from Expert
Given the following list:
children <- list(name=c(‘Willem’, ‘Ella’), age=c(12, 8), male=c(TRUE, FALSE))
which statement will return ‘Ella’ as a character vector?
a) children[‘name’] [ !children[‘male’] ]
b) children[‘name’] [ !children[[‘male’]] ]
c) children[[‘name’]] [ !children[‘male’] ]
d) children[[‘name’]] [ !children[[‘male’]] ]