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Attention | Topic was automatically imported from the old Question2Answer platform. |
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Asked By | The_Duskitty |
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Old Version | Published before Godot 3 was released. |
I dont remember what language it was but you could do random(1,10) or something like that and it would pick a number between 1 to 10, is there a way to do something like this in gdscript?
I think that language was Python.
toivocat | 2021-09-08 20:54
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Reply From: | tiernich |
yes. rand_range(float from, float to)
use randomize() before for “true” random numbers
Okay thanks for the help ^^
The_Duskitty | 2016-04-02 18:55
I like this answer better because it mentions the randomize function, which without it, chooses the same “random” numbers every time.
Oranjoose | 2016-04-16 20:28
Thanks for mentioning randomize. Is there an approach that permits to specify a seed number?
hansolo | 2017-09-07 10:52
RandomNumberGenerator in Godot 3.1 allows to set any seed for each instance, so you could have independent “deterministic” generators in GDScript for different purposes within a game (randomizing different set of independent features).
Xrayez | 2019-06-06 22:52
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Reply From: | batmanasb |
randi()%10+1 returns an int from 1 to 10
randf()*10.0+1.0 returns a float from 1.0 to 10.999999~
rand_range(1,11) returns a float from 1.0 to 10.999999~
range(1,11)[randi()%range(1,11).size()] is a little ugly and less efficient but returns an int from 1 to 10 without you having to do the math yourself (aka the 11+1 part) because all you need to do is set the range()
Answer changed due to more info
The_Duskitty | 2016-04-02 23:44
Yay I won! Take that tiernich!
batmanasb | 2016-04-03 01:23
lol - defeat accepted 
tiernich | 2016-04-03 03:13
To get a random integer between 1 and 10, I find it more intuitive to floor the random float in range. More specifically:
floor(rand_range(1, 11))
Oranjoose | 2016-04-16 20:32
randi()%11+1 is probably biased towards lowest values of 1…10
Omicron | 2017-03-08 09:35
I’m trying to generate a random between 10-30 (randi()%30+10) but it’s giving me a 35. Probably doing it wrong, but can’t figure out how to make it right.
Rodrigo Maller Marti | 2017-05-24 00:11
try (randi()%30)+10
Omicron | 2017-05-24 05:48
Don’t forget to call randomize
jarlowrey | 2017-06-01 15:39
This answer has an important error. If you want to produce a real number in the interval [x,y[, in general you use:
(randf() * (y-x)) + x.
From 1 to 10, you have randf() * 9 + 1. This is because randf() can be 1 as maximum. In this case, you would obtain 9 + 1 = 10. In the case proposed by this answer, randf() * 11 + 1, if by chance randf() turns out to be greater than 0.8 you get something greater than 10. So, there is a 20% chance of having a wrong answer.
VictorSeven | 2017-09-05 18:00
randi()%11+1 returns an int from 1 to 11
If you someone needs a random int between 1 and 10, use:
randi()%10+1
leo_frozen | 2018-11-09 02:20
Please note that randi()%11+1 return a number between 1 and 11 not 10
because randi()%11 can be 10 and adding 1 to it will make it 11. the same thing for randf()
kamel | 2020-04-30 15:45
yes indeed, obviously and i don’t know how we could go so wrong
Omicron | 2020-05-03 09:07
Corrected the inaccuracies. The random floats won’t return a 1.0, but at most .999999~.
The last method using arrays I left, but would recommend int(rand_range(1,11)) as an alternative.
avencherus | 2020-05-05 13:47
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Reply From: | LuminousNutria |
As of Godot 3:
randi() % 20 returns an int from 0 to 19
randi() % 20 + 1 returns an int from 1 to 20
randf() returns a float from 0 to 1
Unfortunately, the older style no longer seems to work.
Just a correction on the third line.
randi() % 20 + 1 won’t return an int from 0 to 20.
It’ll be an int from 1 to 20. Still very helpful, thanks.
idkaryan | 2019-09-11 10:26
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Reply From: | luislodosm |
The following code returns a random number, but it is the same number each time the script is executed:
var random_value = rand_range(1,10)
The following code gives you different random numbers each time the script is executed:
var random_generator = RandomNumberGenerator.new()
random_generator.randomize()
var random_value = random_generator.randf_range(1,10)
or simply:
randomize()
var random_value = rand_range(1,10)
You don’t need to call randomize() every time you pick a random number. Just call it once after starting the project.
Calinou | 2020-05-23 13:27
Oh. You are right. We don’t need to call randomize() in every script.
luislodosm | 2020-05-23 13:45
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Reply From: | auns_ar_kompjuteri |
I needed a rand_range(a, b) but with integers, also to work with negative numbers. I came up with this function.
func randi_range(from, to):
if from > to:
var old_from = from
from = to
to = old_from
return int(floor(rand_range(from , to + 1)))
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Reply From: | Jotag |
You can use key words like randomize for randomizing numbers from 0 to 2^32, rand_range for randomizing an specific range of numbers, for example rand_range(2, 20) will return 2,3,4,5,6…19 or 20. There also at options like randi () or randf but I think those are the more important. I’ll link rand_range since is the specific one in your case: https://docs.godotengine.org/es/stable/getting_started/scripting/c_sharp/c_sharp_differences.html?highlight=Rand_range#random-functions
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Reply From: | Bot7 |
var name = 0
func _ready():
rng.randomize()
name = rng.randi_range(1, 10)
The random number will be between 1 and 10.
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Reply From: | GasStation |
Yea, the best way i found out how is this way:
var RNG = RandomNumberGenerator.new()
func _ready():
RNG.randomize
var rannum = RNG.randf_range([number], [number])
So that’s the code. hopefully it helps!
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Reply From: | lachlananderson512 |
rand_range(float from, float to)
use randomize() before for “true” random numbers
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Reply From: | omel |
use randomize();
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Reply From: | a programmer |
you could use the
randf_range(0,10)
if you want a float
randi_range
or if you want and int
(I think I wrote that right)
I dont think you need to use the randomise() function, please correct me if I am wrong
randf_range() , randi_range() - only works in Godot 4
rustam2704 | 2023-02-12 02:18
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Reply From: | GrayDwarf |
Landed here wanting to find a basic Rand() function that can return a number between low and high. Supports OP original ask in addition to anyone looking for a custom low besides 1. This implementation supports negatives. It hits the low and high without going above or below.
var randNum = Rand(-10, 20)
func Rand(low, high):
return floor(rand_range(low, high + 1))
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Reply From: | idbrii |
In Godot 4, use randf_range(from, to) and randi_range(from, to). They each take a minimum and maximum value, but one is for floats and the other for integers.