random

1.00

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Description

Description:

Random real (floating point) value from 0 (inclusive) to x (not inclusive).

Since Arma 3 v1.55.133393 alternative syntax is added, allowing to define Gaussian Distribution params. Uses the same method as setTriggerTimeout command. Quite useful for spawning loot for example, making more valueable items more rare.

Syntax

Syntax:

random x

Parameters:

x: Number

Return Value:

Number

Alternative Syntax

Syntax:

random [min, mid, max]        Since Arma 3 v1.55.133393

Parameters:

[min, mid, max]: Array

min: Number

mid: Number

max: Number

Return Value:

Number

Examples

Example 1:

_rNumber = random 1;

Example 2:

_rNumber = random -10;

Example 3:

To select random value from an array: _array = ["apples", "pears", "bananas", "M16"]; _random = _array select floor random count _array;

Example 4:

Compare (each command was executed 100000 times to gather statistics):floor random 10; // 0 - 10099 (10%) // 1 - 10040 (10%) // 2 - 10154 (10%) // 3 - 9910 (10%) // 4 - 10023 (10%) // 5 - 9937 (10%) // 6 - 10118 (10%) // 7 - 9716 (10%) // 8 - 9986 (10%) // 9 - 10017 (10%) floor random [0,5,10]; // 0 - 109 (0%) // 1 - 1604 (2%) // 2 - 6839 (7%) // 3 - 16671 (17%) // 4 - 24706 (25%) // 5 - 24702 (25%) // 6 - 16626 (17%) // 7 - 6925 (7%) // 8 - 1702 (2%) // 9 - 116 (0%) floor random [0,10,10]; // 0 - 9 (0%) // 1 - 94 (0%) // 2 - 420 (0%) // 3 - 1197 (1%) // 4 - 2361 (2%) // 5 - 4447 (4%) // 6 - 7082 (7%) // 7 - 9512 (10%) // 8 - 11889 (12%) // 9 - 13093 (13%) // 10 - 49896 (50%) floor random [0,10,5]; // 0 - 11 (0%) // 1 - 98 (0%) // 2 - 430 (0%) // 3 - 1149 (1%) // 4 - 2384 (2%) // 5 - 4546 (5%) // 6 - 8612 (9%) // 7 - 16283 (16%) // 8 - 28393 (28%) // 9 - 38094 (38%)

Additional Information

See also:

Math CommandsselectRandom

Groups:

Uncategorised

Notes

i

Only post proven facts here. Report bugs on the Feedback Tracker and discuss on the Arma Discord or on the Forums.

+ Add Note (Help)

Notes

Posted on July 12, 2015 - 20:32 (UTC)

Hcpookie

Random selections including negative numbers can be obtained via: _Xrnd = round(random 200) -100; This will yield numbers between -100 and 100.

• Be careful using random numbers in multiplayer, each client will come up with a different result. See multiplayer tutorials for more general information about locality.
• The number returned is unlikely to be a whole number.
  To return a whole number use either round, ceil or floor together with random:
  

x=round(random 5) will return 0,1,2,3,4 or 5. (non-uniform distribution, 0 and 5 are half as likely to be selected than any of the other numbers)
x=floor(random 5) will return 0,1,2,3 or 4. (uniform distribution, all numbers have the same probability of being selected)
x=ceil(random 5) will return 0,1,2,3,4 or 5. (0 is very unlikely, but possible, as ceil 0 is 0)