Novice from competent:
What R command does not test if x=”hello” and y=”hello” are equal?
A) %in%
B) =
C) ==
D) identical()
Expert from competent:
Given the follow function foo and the vector vec, which of the following four does not give exactly identical output as the others?
foo <- function(x) x^2
vec = c(1,2)
A) lapply(vec, foo)
B) list(foo(vec[1]), foo(vec[2]))
C) out = list(); for(i in seq_along(vec)) out[[i]] = foo(vec[i]); out
D) foo(vec)