In the matrix created in the previous question do the following:

$-$ compute the sum and the mean for each row and column, respectively

$-$ compute the cumulative sum for each row and column, respectively

$-$ compute the square root of each data element row$-$wise, and store the results in a new matrix

$-$ compute the logarithm of each data element row$-$wise, and store the results in a new matrix

Hint: use the apply$()$ function.