[jira] Updated: (MATH-391) Inconsistent behaviour of constructors in ArrayRealVector class

["Roman Werpachowski (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MATH-391?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Roman Werpachowski updated MATH-391:
------------------------------------

    Description: 
ArrayRealVector(double[] d) allows to construct a zero-length vector, but ArrayRealVector(double[] d, boolean copyArray) doesn't. Both should allow this as zero-length vectors are mathematically well-defined objects and they are useful boundary cases in many algorithms.

This breaks some arithmetic operators (addition) on zero-length real vectors which worked in 2.0 but don't work in 2.1

  was:
ArrayRealVector(double[] d) allows to construct a zero-length vector, but ArrayRealVector(double[] d, boolean copyArray) doesn't. Both should allow this as zero-length vectors are mathematically well-defined objects and they are useful boundary cases in many algorithms.

Zero-length vectors worked in version 2.0, they should be working in 2.1 as well.


> Inconsistent behaviour of constructors in ArrayRealVector class
> ---------------------------------------------------------------
>
>                 Key: MATH-391
>                 URL: https://issues.apache.org/jira/browse/MATH-391
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 2.1
>            Reporter: Roman Werpachowski
>
> ArrayRealVector(double[] d) allows to construct a zero-length vector, but ArrayRealVector(double[] d, boolean copyArray) doesn't. Both should allow this as zero-length vectors are mathematically well-defined objects and they are useful boundary cases in many algorithms.
> This breaks some arithmetic operators (addition) on zero-length real vectors which worked in 2.0 but don't work in 2.1

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