Difference between revisions of "random"
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[[Image:bellcurve.jpgright200px]] Random real (floating point) value from 0 (inclusive) to x (not inclusive).<br><br>  [[Image:bellcurve.jpgright200px]] Random real (floating point) value from 0 (inclusive) to x (not inclusive).<br><br>  
−  Since Arma 3 v1.55.133393 alternative syntax is added, allowing to define [https://en.wikipedia.org/wiki/Normal_distribution Gaussian Distribution] params. Uses the same method as [[setTriggerTimeout]] command. Quite useful for spawning loot for example, making more  +  Since Arma 3 v1.55.133393 alternative syntax is added, allowing to define [https://en.wikipedia.org/wiki/Normal_distribution Gaussian Distribution] params. Uses the same method as [[setTriggerTimeout]] command. Quite useful for spawning loot for example, making more valuable items more rare. = Description 
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Revision as of 00:52, 17 November 2015
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 valuable items more rare.  Groups:
 Uncategorised
Syntax
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
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
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=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)
Categories:
 Scripting Commands
 Introduced with Operation Flashpoint version 1.00
 Operation Flashpoint: New Scripting Commands
 Operation Flashpoint: Scripting Commands
 Command Command : Uncategorised
 Scripting Commands OFP 1.99
 Scripting Commands OFP 1.96
 Scripting Commands OFP 1.46
 Scripting Commands ArmA
 Command Group: Variables
 Scripting Commands ArmA2
 Scripting Commands Arma 3
 Scripting Commands Take On Helicopters