How do i hold a number from a randi

Hey, I have to create a dice rolling code for a Yahtzee game and I don't know how to hold the dice so that the rest can be re-rolled. Additionally the version my group is making is not text based it has a UI. Thank You in advance.

[James Tursa]

How are you holding the current roll numbers? In a 5-element variable with element values 1 to 6?

How is the user selecting the dice to re-roll? In a vector of 0 to 5 elements with numbers 1 to 5? Or ...?

Answer 1

[John D'Errico]

Well, if you've gotten to the point of knowing how to use randi, I might as well give you a hint.

Dice = randi(6,[1 5])
Dice =
     3     5     4     4     6

I could go for a straight now, or for 3 or 4 of a kind in 4s.

replacements = [1 2 5];

Dice(replacements) = randi(6,[1,numel(replacements)])
Dice =
     2     5     4     4     5

Try for another 4 or a 5.

replacements = [1];
Dice(replacements) = randi(6,[1,numel(replacements)])
Dice =
     3     5     4     4     5

Looks like 2 pairs to me. Maybe I should have tried for the straight instead?

[John D'Errico]

If you have a list of dice that you want to hold, use setdiff.

replace = setdiff(1:5,hold);