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