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From "Luc Maisonobe (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (MATH-391) Inconsistent behaviour of constructors in ArrayRealVector class
Date Sun, 03 Oct 2010 16:43:33 GMT

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

Luc Maisonobe resolved MATH-391.
--------------------------------

    Resolution: Fixed

Fixed in subversion repository as of r1003993 for barnch 2.X and r1003994 for trunk.
Note that the same problem occurred also in ArrayFieldVector but the fix is different. For
Field-based vectors, we need to get the field, so either we use a non-empty array and retrieve
the field from the first array element or we add a parameter for the field and allow the array
to be empty. The two choices are now possible, as new constructors have been added and the
javadoc updated to explain this behavior.
Thanks for reporting the issue.

> 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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