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From "Phil Steitz (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MATH-391) Inconsistent behaviour of constructors in ArrayRealVector class
Date Sun, 03 Oct 2010 01:56:33 GMT

    [ https://issues.apache.org/jira/browse/MATH-391?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12917274#action_12917274
] 

Phil Steitz commented on MATH-391:
----------------------------------

I agree that the code should be consistent.  I agree as well that a zero-dimensional vector
is legit.   Can anyone explain why ArrayRealVector(double[] d, boolean copyArray) requires
positive length?

> 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
>             Fix For: 2.2
>
>
> 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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