Question

Which of the following sort a dataframe by the order of the elements in B? (a) x[rev(order(x$B)),] (b) x[ordersort(x$B),] (c) x[order(x$B),] (d) x[rev(x$B),] The question was posed to me in a job interview. Question is from Commands topic in section Commands, Packages, Visualizing Data and Linear Regression of R Programming Select the correct answer from above options

Answer 1

Correct option is (a) x[rev(order(x$B)),] To elaborate: x[rev(order(x$B)),] sort the dataframe in reverse order.