$9.$ Create a $100000$ by $10$ matrix with the numbers $1$:$1000000.$ Make a for$-$loop that calculates the sum for

each row of the matrix and stores the results in a list $$rowAdd$.$ Verify that your results are consistent with

what you obtain with the apply function to calculate row sums as well as with the built$-$in rowSums function.

Side Note: In R$,$ always pre$-$allocate your vectors and update the values instead of creating an empty vector

and appending to it which is a significantly slower operation.