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|game1= ofp | |game1= ofp | ||
|version1= 1.00 | |version1= 1.00 | ||
|game2= ofpe | |game2= ofpe | ||
|version2= 1.00 | |version2= 1.00 | ||
|game3= arma1 | |game3= arma1 | ||
|version3= 1.00 | |version3= 1.00 | ||
|game4= arma2 | |game4= arma2 | ||
|version4= 1.00 | |version4= 1.00 | ||
|game5= arma2oa | |game5= arma2oa | ||
|version5= 1.50 | |||
|version5= 1. | |||
|game6= tkoh | |game6= tkoh | ||
|version6= 1.00 | |version6= 1.00 | ||
|game7= arma3 | |game7= arma3 | ||
|version7= 0.50 | |version7= 0.50 | ||
|gr1= Math | |gr1= Math | ||
|descr= [[Image:bellcurve.jpg| | |descr= [[Image:bellcurve.jpg|thumb|120px|[[#Syntax 2|Syntax 2]]'s distribution]] | ||
{{{!}} | |||
! style="padding-right: 1em; vertical-align: top; white-space: nowrap" {{!}} {{Link|#Syntax 1}} | |||
{{!}} generates a random floating point value | |||
{{!}}- | |||
! style="padding-right: 1em; vertical-align: top; white-space: nowrap" {{!}} {{Link|#Syntax 2}} | |||
{{!}} generates a {{Wikipedia|Normal_distribution|Gaussian Distribution}}<ref>Technically, it is a rescaled {{Wikipedia|Bates distribution}} with n = 4. The distribution is split in two at its midpoint and scaled linearly such that its maximum lies at the specified midpoint.</ref>. It uses the same method as [[setTriggerTimeout]] command and is quite useful for e.g spawning loot, making more valuable items more rare | |||
{{!}}- | |||
! style="padding-right: 1em; vertical-align: top; white-space: nowrap" {{!}} {{Link|#Syntax 3}} | |||
{{!}} generates a {{Wikipedia|Random seed|seed-based}} random number | |||
{{!}}- | |||
! style="padding-right: 1em; vertical-align: top; white-space: nowrap" {{!}} {{Link|#Syntax 4}} | |||
{{!}} generates a {{Wikipedia|Random seed|seed-based}} random noise ('''not''' Perlin) texture based on provided seed and returning the value at supplied coordinates | |||
{{!}}} | |||
|s1= [[random]] x | |s1= [[random]] x | ||
Line 42: | Line 43: | ||
|p1= x: [[Number]] | |p1= x: [[Number]] | ||
|r1= [[Number]] | |r1= [[Number]] from 0 (included) to ''x'' (excluded) | ||
|s2= [[random]] [min, mid, max] | |s2= [[random]] [min, mid, max] | ||
| | |s2since= arma3 1.56 | ||
| | |p21= min: [[Number]] | ||
| | |p22= mid: [[Number]] | ||
| | |p23= max: [[Number]] | ||
|r2= [[Number]] | |r2= [[Number]] in range from ''min'' to ''max'', weighted by ''mid'' | ||
|s3= seed [[random]] x | |s3= seed [[random]] x | ||
|p41= seed: [[Number]] | |s3since= arma3 1.68 | ||
|p41= seed: [[Number]] - an '''integer'''. Any float value will be truncated (e.g -0.9, -0.1, 0.1 or 0.9 will be read as '''0''') | |||
|p42= x: [[Number]] | |p42= x: [[Number]] | ||
|r3= [[Number]] | |r3= [[Number]] from 0 (included) to ''x'' (excluded) | ||
|s4= seed [[random]] [x, y] | |s4= seed [[random]] [x, y] | ||
|s4since= arma3 1.68 | |||
|p61= seed: [[Number]] | |p61= seed: [[Number]] | ||
|p62= | |p62= x: [[Number]] - x texture position | ||
|p63= | |p63= y: [[Number]] - y texture position | ||
| | |r4= [[Number]] from 0 (included) to 1 (excluded) | ||
|x1= <sqf>_rNumber = random 1;</sqf> | |||
|x1= < | |||
|x2= < | |x2= <sqf>_rNumber = random -10;</sqf> | ||
|x3= Generate a random position inside a circle (see also [[Example Code: Random Area Distribution]]) | |x3= Generate a random position inside a circle (see also [[Example Code: Random Area Distribution]]) | ||
< | <sqf>_center getPos [_radius * sqrt random 1, random 360];</sqf> | ||
|x4= | |x4= Select a random value from an array: | ||
< | <sqf>_array = ["apples", "pears", "bananas", "M16"]; | ||
|seealso= [[selectRandom]] | _random = _array select floor random count _array; // Before Arma 2 | ||
_random = _array call BIS_fnc_selectRandom; // Since Arma 2 | |||
_random = selectRandom _array; // Since Arma 3 v1.56</sqf> | |||
|seealso= [[selectRandom]] [[selectRandomWeighted]] | |||
}} | }} | ||
<dl class="command_description"> | |||
<dt></dt> | <dt></dt> | ||
<dd class="notedate">Posted on July 12, 2015 - 20:32 (UTC)</dd> | <dd class="notedate">Posted on July 12, 2015 - 20:32 (UTC)</dd> | ||
Line 99: | Line 103: | ||
<dd class="note"> | <dd class="note"> | ||
Random selections including negative numbers can be obtained via: | Random selections including negative numbers can be obtained via: | ||
<sqf>_Xrnd = round(random 200) -100;</sqf> | |||
This will yield numbers between -100 and 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. | * 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.<br> | * The number returned is unlikely to be a whole number.<br> | ||
To return a whole number use either '''[[round]]''', '''[[ceil]]''' or '''[[floor]]''' together with [[random]]: | To return a whole number use either '''[[round]]''', '''[[ceil]]''' or '''[[floor]]''' together with [[random]]: | ||
< | <sqf> | ||
x = floor(random 5) will return 0,1,2,3 or 4. (uniform distribution, all numbers have the same probability of being selected) | 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 = ceil(random 5) will return | 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) | |||
</sqf> | |||
</dd> | </dd> | ||
<dd class="notedate">Posted on July 22, 2018 - 12:58 (UTC+2)</dd> | <dd class="notedate">Posted on July 22, 2018 - 12:58 (UTC+2)</dd> | ||
<dt class="note">[[User:Lou Montana|Lou Montana]]</dt> | <dt class="note">[[User:Lou Montana|Lou Montana]]</dt> | ||
<dd class="note"> | <dd class="note"> | ||
{ | {| class="wikitable" | ||
|+ Repartition comparison | |||
! Formula | ! Formula | ||
! 0 | ! 0 | ||
Line 125: | Line 132: | ||
! 8 | ! 8 | ||
! 9 | ! 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% | |||
|} | |||
</dd> | </dd> | ||
</dl> | </dl> |
Revision as of 18:44, 4 January 2023
Description
- Description:
-
Syntax 1 generates a random floating point value Syntax 2 generates a Gaussian Distribution[1]. It uses the same method as setTriggerTimeout command and is quite useful for e.g spawning loot, making more valuable items more rare Syntax 3 generates a seed-based random number Syntax 4 generates a seed-based random noise (not Perlin) texture based on provided seed and returning the value at supplied coordinates - Groups:
- Math
Syntax 1
Syntax 2
- Syntax:
- random [min, mid, max]
- Parameters:
- min: Number
- mid: Number
- max: Number
- Return Value:
- Number in range from min to max, weighted by mid
Syntax 3
- Syntax:
- seed random x
- Parameters:
- seed: Number - an integer. Any float value will be truncated (e.g -0.9, -0.1, 0.1 or 0.9 will be read as 0)
- x: Number
- Return Value:
- Number from 0 (included) to x (excluded)
Syntax 4
- Syntax:
- seed random [x, y]
- Parameters:
- seed: Number
- x: Number - x texture position
- y: Number - y texture position
- Return Value:
- Number from 0 (included) to 1 (excluded)
Examples
- Example 1:
- Example 2:
- Example 3:
- Generate a random position inside a circle (see also Example Code: Random Area Distribution)
- Example 4:
- Select a random value from an array:
_array = ["apples", "pears", "bananas", "M16"]; _random = _array select floor random count _array; // Before Arma 2 _random = _array call BIS_fnc_selectRandom; // Since Arma 2 _random = selectRandom _array; // Since Arma 3 v1.56
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:
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.
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%
- ↑ Technically, it is a rescaled Bates distribution with n = 4. The distribution is split in two at its midpoint and scaled linearly such that its maximum lies at the specified midpoint.
Categories:
- Scripting Commands
- Introduced with Operation Flashpoint version 1.00
- Operation Flashpoint: New Scripting Commands
- Operation Flashpoint: Scripting Commands
- Operation Flashpoint: Elite: Scripting Commands
- ArmA: Armed Assault: Scripting Commands
- Arma 2: Scripting Commands
- Arma 2: Operation Arrowhead: Scripting Commands
- Take On Helicopters: Scripting Commands
- Arma 3: Scripting Commands
- Command Group: Math