Rolling dice multiple times?

I want to have my code to roll five dice once, which I will do using the randi command. I then want to reroll certain dice two more times. For example, after the first roll maybe I want to keep dice 2 and 4, but I want to reroll the rest. Can someone give me some insight into how I would do this. I just want some guidance toward this. Your help is appreciated. Thanks.

Answer 1

[Walter Roberson]

Hint:

rolled(columns_to_discard) = new_random_values;