First of all, you need to cast R to be int32 because it's floating point. You can't have the 42.123'th row of a matrix (unless you want to do interpolation).
Next, you'll need to get more than 1000 rows to account for repeats. What if you get row 42 (after rounding) 2 or 3 times? It would only get transferred once. So you'll have to call unique() to pull out only unique rows. You may want to ask for 2000 numbers just to make sure you can always extract 1000 unique numbers.
I can't do it for you because I don't have whatever toolbox normrnd() is in (please enter that into the products list above.)
