[jira] [Work logged] (MATH-1597) Low-discrepancy sequence

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MATH-1597?focusedWorklogId=604545&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-604545 ]

ASF GitHub Bot logged work on MATH-1597:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 01/Jun/21 14:55
            Start Date: 01/Jun/21 14:55
    Worklog Time Spent: 10m 
      Work Description: coveralls commented on pull request #187:
URL: https://github.com/apache/commons-math/pull/187#issuecomment-852192805


   
   [![Coverage Status](https://coveralls.io/builds/40205845/badge)](https://coveralls.io/builds/40205845)
   
   Coverage decreased (-0.01%) to 90.362% when pulling **645f2f5493fc64b9d04d4b42325689788498ddf3 on samyBadjoudj:feature/MATH-1597** into **787d42ef07e6dc8d7aa47a9156d851281a7f2954 on apache:master**.
   


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Issue Time Tracking
-------------------

    Worklog Id:     (was: 604545)
    Time Spent: 20m  (was: 10m)

> Low-discrepancy sequence
> ------------------------
>
>                 Key: MATH-1597
>                 URL: https://issues.apache.org/jira/browse/MATH-1597
>             Project: Commons Math
>          Issue Type: Sub-task
>            Reporter: Gilles Sadowski
>            Priority: Minor
>             Fix For: 4.0
>
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> Two low-discrepancy sequences are implemented in Commons Math (in package {{o.a.c.math4.legacy.random}}:
> * {{SobolSequenceGenerator}}
> * {{HaltonSequenceGenerator}}
> They both provide several methods:
> * {{nextVector()}}
> * {{skipTo(int)}}
> * {{getNextIndex()}}
> of which only the first is part of their common API through the {{RandomVectorGenerator}}.
> I propose to create an interface that would better represent the specific concept (and avoid the confusion with pseudo-random generators):
> {code}
> public interface LowDiscrepancySequence extends Supplier<double[]> { /* ... */}
> {code}
> Thus, instead of class {{SobolSequenceGenerator}} we'd have:
> {code}
> public class SobolSequence implements LowDiscrepancySequence {
>     // ...
> }
> {code}
> This functionality could be moved to a new {{o.a.c.m.legacy.quasirandom}} package (?).
> Method {{skipTo}} could be replaced with an API similar to Commons RNG {{JumpableUniformRandomProvider}} (?).



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