Chapter 20, Problem 8ICA

Write a function named GetArray that will accept two positive integers R and c representing the number of rows and columns of a matrix NA, and return the R × C matrix NA with values input by the user. For each value to be input a prompt should appear similar to the following:

Please input the value for row 2 and column 4:

with, of course, the 2 and 4 replaced by the indices of the actual element being entered.