Difference between revisions of "random"
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Lou Montana (talk  contribs) m (Text replacement  "[[Category:Scripting Commands ArmA" to "[[Category:Scripting Commands Armed Assault") 

(56 intermediate revisions by 22 users not shown)  
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−  +  {{CommandComments=  
−  +  ____________________________________________________________________________________________  
−  
−  
−  +   ofp Game name=  
−  +  1.00Game version=  
+  ____________________________________________________________________________________________  
+  [[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 the definition of [https://en.wikipedia.org/wiki/Normal_distribution Gaussian Distribution]<ref>Technically, it is a rescaled [https://en.wikipedia.org/wiki/Bates_distribution 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> params. Uses the same method as [[setTriggerTimeout]] command. Quite useful for spawning loot for example, making more valuable items more rare ('''Alternative Syntax 1''')<br><br>  
+  Since Arma 3 v1.67.139663 two alternative syntaxes are available:  
+  * allowing to generate semirandom number based on provided seed ('''Alternative Syntax 2''')  
+  * generating pseudorandom [https://en.wikipedia.org/wiki/Perlin_noise noise texture] based on provided seed and returning a single number between 0 (included) and 1 (excluded) at supplied ''x'' and ''y'' coordinates ('''Alternative Syntax 3''') Description=  
+  ____________________________________________________________________________________________  
−  +   [[random]] x Syntax=  
−  +  p1= x: [[Number]] Parameter 1=  
−  +   [[Number]] Return value=  
+  ____________________________________________________________________________________________  
−  [[Number]]  +  s2= [[random]] [min, mid, max] {{sincearma31.55.133393y}} Syntax 2= 
+  p21= [min, mid, max]: [[Array]] Parameter 21=  
+  p22= min: [[Number]] Parameter 22=  
+  p23= mid: [[Number]] Parameter 23=  
+  p24= max: [[Number]] Parameter 24=  
+  r2= [[Number]]Return value 2=  
+  ____________________________________________________________________________________________  
−  +  s3= seed [[random]] x {{sincearma31.67.139663y}} Syntax 3=  
+  p41= seed: [[Number]] Parameter 41=  
+  p42= x: [[Number]] Parameter 42=  
+  r3= [[Number]]  value from 0 to x Return value 3=  
+  ____________________________________________________________________________________________  
−  +  s4= seed [[random]] [x, y] {{sincearma31.67.139663y}} Syntax 4=  
+  p61= seed: [[Number]] Parameter 61=  
+  p62= [x, y]: [[Array]] position on the [https://en.wikipedia.org/wiki/Perlin_noise Perlin noise texture] Parameter 62=  
+  p63= x: [[Number]] Parameter 63=  
+  p64= y: [[Number]] Parameter 64=  
+  r4= [[Number]]  value from 0 to 1 Return value 4=  
+  ____________________________________________________________________________________________  
+  
+  x1= <code>_rNumber = [[random]] 1;</code> Example 1=  
+  x2= <code>_rNumber = [[random]] 10;</code> Example 2=  
−  +  x3= Generate a random position inside a circle (see also [[Example Code: Random Area Distribution]])  
+  <code>_center [[getPos]] [<nowiki/>_radius * [[sqrt]] [[random]] 1, [[random]] 360];</code> Example 3=  
−  +  x4= To select random value from an array:  
+  <code>_array = ["apples", "pears", "bananas", "M16"];  
+  _random = _array [[select]] [[floor]] [[random]] [[count]] _array;  
+  {{cc{{sincearma31.55.133393}}}}  
+  _random = [[selectRandom]] _array;</code> Example 4=  
+  ____________________________________________________________________________________________  
+   [[Math Commands]], [[selectRandom]], [[selectRandomWeighted]] See also=  
+  }}  
−  +  <h3 style="display:none">Notes</h3>  
−  +  [[Category:Scripting Commands{{uc:{{PAGENAME}}}}]]  
+  [[Category:Scripting Commands OFP 1.46{{uc:{{PAGENAME}}}}]]  
+  [[Category:Scripting Commands OFP 1.96{{uc:{{PAGENAME}}}}]]  
+  [[Category:Scripting Commands OFP 1.99{{uc:{{PAGENAME}}}}]]  
+  [[Category:Scripting Commands Armed Assault{{uc:{{PAGENAME}}}}]]  
+  [[Category:Scripting Commands Arma 2{{uc:{{PAGENAME}}}}]]  
+  [[Category:Scripting Commands Arma 3{{uc:{{PAGENAME}}}}]]  
+  [[Category:Scripting Commands Take On Helicopters{{uc:{{PAGENAME}}}}]]  
+  [[Category:Command_Group:_Variables{{uc:{{PAGENAME}}}}]]  
−  +  <! CONTINUE Notes >  
+  <dl class="command_description">  
+  <dd class="notedate">Posted on July 12, 2015  20:32 (UTC)</dd>  
+  <dt class="note">[[User:HcpookieHcpookie]]</dt>  
+  <dd class="note">  
+  Random selections including negative numbers can be obtained via:  
−  +  <code>_Xrnd = round(random 200) 100;</code>  
−  The number returned is unlikely to be a whole number (  +  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.<br>  
+  To return a whole number use either '''[[round]]''', '''[[ceil]]''' or '''[[floor]]''' together with [[random]]:  
+  <code>x = round(random 5) will return 0,1,2,3,4 or 5. (nonuniform 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)</code>  
+  </dd>  
+  <dd class="notedate">Posted on July 22, 2018  12:58 (UTC+2)</dd>  
+  <dt class="note">[[User:Lou MontanaLou Montana]]</dt>  
+  <dd class="note">  
+  {{{!}}class="bikitable"  
+  {{!}}+ 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%  
+  {{!}}}  
+  </dd>  
+  </dl>  
+  <! DISCONTINUE Notes > 
Revision as of 20:48, 3 June 2020
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.
x = round(random 5) will return 0,1,2,3,4 or 5. (nonuniform 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%