please give me a matlab code! (with explanations if possible)

13. Create a matrix, say H, whose first row lists 0., 1, ...,9, whose second row lists 10, 11,..., 19, ..., and whose 10th row lists 90, 91, ..., 99 a. Find the sum of the numbers in each column of H b. Find the product of sums of the columns as computed in part a