random

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Description

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Description needed
Groups:: Math

Syntax 1

Syntax:: Syntax needed
Parameters:: x: Number
Return Value:: Return value needed

Syntax 2

Syntax:: random [min, mid, max] Template:Since
Parameters:: [min, mid, max]: Array
: min: Number
: mid: Number
: max: Number
Return Value:: Number

Syntax 3

Syntax:: seed random x Template:Since
Parameters:: seed: Number
: x: Number
Return Value:: Number - value from 0 to x

Syntax 4

Syntax:: seed random [x, y] Template:Since
Parameters:: seed: Number
: [x, y]: Array position on the Perlin noise texture
: x: Number
: y: Number
Return Value:: Number - value from 0 to 1

Examples

Example 1:: _rNumber = random 1;
Example 2:: _rNumber = random -10;
Example 3:: Generate a random position inside a circle (see also Example Code: Random Area Distribution) _center getPos [_radius * sqrt random 1, random 360];
Example 4:: To select random value from an array: _array = ["apples", "pears", "bananas", "M16"]; _random = _array select floor random count _array; // Template:Since _random = selectRandom _array;

Additional Information

See also:: selectRandom selectRandomWeighted

Notes

: Report bugs on the Feedback Tracker and/or discuss them on the Arma Discord or on the Forums.
Only post proven facts here! Add Note

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)

Posted on July 22, 2018 - 12:58 (UTC+2)

Lou Montana

Repartition comparison
Formula	0	1	2	3	4	5	6	7	8	9
floor random 10;	10%	10%	10%	10%	10%	10%	10%	10%	10%	10%
floor random [0, 5, 10]	0%	2%	7%	17%	25%	25%	17%	7%	2%	0%
floor random [0, 10, 0]	0%	0%	1%	2%	5%	9%	14%	19%	24%	26%
floor random [0, 10, 5]	0%	0%	0%	1%	2%	5%	9%	16%	28%	38%