Question

Which of the following statement finds the maximum for each column?

(a) apply(x,2,max)

(b) col.max(x)

(c) which.min(x)

(d) which.max(x)

I had been asked this question during an interview for a job.

Asked question is from Commands topic in chapter Commands, Packages, Visualizing Data and Linear Regression of R Programming

Answer 1

The correct answer is (a) apply(x,2,max)

The best I can explain: col.max(x) is another way to find which column has the maximum value for each row.