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Because [[Iota]] depends on [[index origin]], Roll depends on index origin unless every number in the argument is 0. | Because [[Iota]] depends on [[index origin]], Roll depends on index origin unless every number in the argument is 0. | ||
The choices made by Roll do not have to be truly random: they may be pseudorandom (generated by a deterministic but difficult to predict algorithm) or taken from the operating system. They way random numbers are generated is controlled by the [[random link]] <source lang=apl inline>⎕RL</source>. | The choices made by Roll do not have to be truly random: they may be pseudorandom (generated by a deterministic but difficult to predict algorithm) or taken from the operating system. They way random numbers are generated is controlled by the [[random link]] <source lang=apl inline>⎕RL</source>. Traditionally, APL uses the [[wikipedia:Lehmer random number generator|Lehmer random number generator]], but [[Dyalog APL]] defaults to the allow choosing a different random number generator and defaults to the [[wikipedia:Mersenne Twister|Mersenne Twister]]. | ||
== External links == | == External links == | ||
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=== Documentation === | === Documentation === | ||
* [http://help.dyalog.com/latest/ | * [http://help.dyalog.com/latest/index.htm#Language/Primitive%20Functions/Roll.htm Dyalog] | ||
* [http://microapl.com/apl_help/ch_020_020_170.htm APLX] | * [http://microapl.com/apl_help/ch_020_020_170.htm APLX] | ||
* [https://www.jsoftware.com/help/dictionary/d640.htm J Dictionary], [https://code.jsoftware.com/wiki/Vocabulary/query J NuVoc] | * [https://www.jsoftware.com/help/dictionary/d640.htm J Dictionary], [https://code.jsoftware.com/wiki/Vocabulary/query J NuVoc] | ||
{{APL built-ins}} | {{APL built-ins}}[[Category:Primitive functions]][[Category:Scalar monadic functions]] | ||