Question

__________ function is used in applying a function each level of factors.

(a) With()

(b) By()

(c) To()

(d) Here()

I had been asked this question during an interview.

I would like to ask this question from Functions in division Control Structures, Functions, Scoping Rules, Loop Functions and Debugging of R Programming

Answer 1

Correct answer is (b) By()

For explanation: BY () function is used for applying a function each level of factors. R has a large number of in-built functions and also user can create their own functions. In R, a function is an object. So the R interpreter is able to pass control to the function.