Alex D Herbert created RNG-81:
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Summary: NumberFactory
Key: RNG-81
URL: https://issues.apache.org/jira/browse/RNG-81
Project: Commons RNG
Issue Type: Improvement
Components: core
Affects Versions: 1.3
Reporter: Alex D Herbert
Assignee: Alex D Herbert
Fix For: 1.3
Change the number factory methods for {{nextFloat}} and {{nextDouble}}.
Currently the methods use:
* 23-bits of state from an int to create a float
* 52-bits of state from a long to create a double
This method produces output floating point numbers with the final bit of the
mantissa set to 0. The methods can be changed to use 24-bits and 53-bits of
state respectively.
This will match the implementation in {{java.util.SplittableRandom}}.
Benchmarking has shown no noticeable difference in speed.
Note that this change modifies the output {{float}} to evenly sample all
{{k/2^-24}} [dyadic rationals|https://en.wikipedia.org/wiki/Dyadic_rational]
and the {{double}} to evenly sample all {{k/2^-53}} dyadic rationals, i.e. the
maximum number representable between 0 (inclusive) and 1.0 (exclusive).
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