[RMVX ACE] HOW DO I MAKE RANDOM NUMBERS TRULY RANDOM?

That meens at it random it, but somehow take just half number.
Thats because it can´t know what it giwe last play.

Short of a quantum random number generator, the one that comes with RM is about as decent as you'll get. I've never had issues with it, either. You're not using a seed, are you? That would give the same result every time.

You can consider making your game more deterministic if RNG is not working out for you.

author=kylebstiff
I had seventeen different things that could happen, but the same thing happened twice in a row, so I assumed something wonky was going on.

That's completely possible, though. Sure the chances of that happening are much smaller than a different outcome occurring, but it can still happen.

Now if you had gotten the same thing several times in a row, that's a different story IMO

Do remember: Our minds like to play tricks on us, we like to see patterns everywhere. If you're rolling random numbers with the computer, its effectively as random as you are going to get, barring using the radiation noise of the universe like some things do. Your mind will always make patterns though, and having two back to back same results doesn't mean its not random. Remember, random means that each result is independent of the next. While rolling the same thing 15 times is unlikely, its still possible.

The odds of one in seventeen things happening twice in a row is only 1 / 17 which aren't awful odds or anything. If you're testing randomness you should definitely use a larger sampling population than two! It's more likely that there's a bug in what pulls your random numbers or how you use it than in the randomness of the RNG. For example maybe your random number generator is only creating a number between 1 and 2 because its min/max values were improperly set. Better random numbers are only needed for things like cryptography than randomness in a video game.

No, because the first RNG number actually doesn't matter as long as all values are possible with the same probability. The only important thing is that the second event is the same as the first which is a 1 / 17 chance of it happening. If you wanted one particular event to occur twice in a row then you'd have two 1 / 17 chances trying to get the same desired event which you multiply to gether to get 1 / 289.


There are definitely difficulties in RNG but since the days of BASIC it has been abstracted out into the languages framework or core libraries *. It's possible to get Ruby to use a RNG generator with the same seed but you have to explicitly mark it so. There's other languages where you have to give a seed (usually based on the computer time) or hardware (old console RNG is usually more deterministic or based on the # of frames since the game started) and work for RNGs but that's largely days gone by.


* Security and cryptography are the biggest cases of "RNG is hard". Your RNG needs to appear as random as possible to prevent a malicious force from reverse engineering your RNG and determining what your next 'random' number is which could be the basis of an attack against your software.