Question

___________ remove all the variables from the workspace.

(a) rm(x)

(b) rm(list=ls())

(c) ls()

(d) attach(mat)

I had been asked this question in an internship interview.

Query is from Commands in section Commands, Packages, Visualizing Data and Linear Regression of R Programming

Answer 1

Right choice is (b) rm(list=ls())

To explain: attach(mat) make the names of the variables in the matrix or data frame available in the workspace.