Probability System

[Maaron85_1 (maaron)]

hey! so i’ve been trying to make a chance system but none of the posts i’ve read helped me because everyone links that one weighted chance system post and i dont really understand it (oh and also it doesnt work for me)

so i came up with a solution, but theres a problem
it is very bad and i think it might cause lag

(here it is, prepare your eyes)

local rarities = {
	
	Common = 75,
	Uncommon = 20,
	Rare = 5
	
	
}

local function getRandom()
	local raritytable = {}
	for rarity,percentage in pairs(rarities) do
		for i = 1, percentage do
			table.insert(raritytable, rarity)
		end
	end
	print(raritytable[math.random(1, #raritytable)])
end

getRandom()

anyways if anyone could help it would be awesome, thanks!

[Jopio0819 (Jopio_Playzz)]

I think you can better use the math.random function.
If you do a random between 1 and 20, and 1 is the rare one, you have a easy solution for your problem.
I know this is not the most efficient way, but should work.

[bluebxrrybot (blueberry)]

Change category to #help-and-feedback:scripting-support.

Have you seen mine?

Chance (easy random items + luck modifiers)!

Chance By @avodey (my main account)! Module Summary (v1.0.1) We’ve all been there. Making a chance system is quite the challenge, especially if you wanted to also add a “2x Luck gamepass” or some sort of luck modifier. What does double the luck even mean? What if they’re too lucky?? This module will allow you to make an easy chance system with no worries! You will be able to create a Chance generator that takes in a dictionary like this: Apple: 50 Banana: 20 Orange: 15 Pe…

[Maaron85_1 (maaron)]

this looks like exactly what i need! does it support decimals?

[bluebxrrybot (blueberry)]

It does! Just note that the chances must not add to over 100, or it will error. If they’re under 100, there’s a chance you could get nil back when generating a random item.

I plan to also remake the luck system because I’m not satisfied with how its made.

[2112Jay]

Here is a good Probability System plan and simple. (had to test it, sorry late post)

local function pickItem()
	local items = {
		Common = 75,
		Uncommon = 20,
		Rare = 10,
		Epic = 5,
		Legendary = 1
	}

	local roll = math.random(1, 100)
	local min = math.huge
	local pick

	for item, chance in pairs(items) do
		local diff = roll - chance
		if diff >= 0 and diff < min then
			min = diff
			pick = item
		end
	end

	return pick
end


print("Item:", pickItem())

This really is using a 1-100 percentage to item level.
(rounding downwards)