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2015-12-07Correct rand:export_seed/0 when there is no prior seedBjörn Gustavsson
According to the documentation, rand:export_seed/0 should return 'undefined' if the seed has not been intialized. However, it will create and return a seed. That means that the following code will not work as expected: case rand:export_seed() of undefined -> rand:seen({1,2,3}); _ -> ok end, rand:uniform(Range)
2015-09-11rand_SUITE: Speed up basic_stats/1Björn Gustavsson
Refactor basic_stats/1 into three separate test cases that can be run in parallel.
2015-06-18Change license text to APLv2Bruce Yinhe
2015-05-25stdlib: Relax rand_SUITE timeoutBjörn-Egil Dahlberg
2015-04-30stdlib: Document and add normal distributed random value functionDan Gudmundsson
It is needed in various tests. It uses the Ziggurat algorithm, which is the fastest that I know.
2015-04-29stdlib: Add new random functionality/moduleKenji Rikitake
The old random module contains an old algorithm which have flaws and the api requires the user to invoke seed and or checking if seed have been invoked, if a non constant seed is to be used. The api contains the following features: - The user can invoke rand:unform/[0|1] directly and get a non constant seeding. - The api is split in functional and non functional functions, i.e. usage of _s functions will not affect the process dictionary. - The api contains several algorithms with different characteristics and can be extended with new algorithms in the future. - Contains state of the art random number generators. - Default algorithm is taylor made for erlang to be fast on 64bits machines.