[jira] [Updated] (MATH-1682) RealVector.sparseIterator() throws OutOfRangeException for empty vectors

["Ruiqi Dong (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MATH-1682?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ruiqi Dong updated MATH-1682:
-----------------------------
    Priority: Critical  (was: Minor)

> RealVector.sparseIterator() throws OutOfRangeException for empty vectors
> ------------------------------------------------------------------------
>
>                 Key: MATH-1682
>                 URL: https://issues.apache.org/jira/browse/MATH-1682
>             Project: Commons Math
>          Issue Type: Bug
>          Components: legacy
>            Reporter: Ruiqi Dong
>            Priority: Critical
>   Original Estimate: 0.5h
>  Remaining Estimate: 0.5h
>
> When calling {{sparseIterator()}} on an empty {{RealVector}} (dimension = 0), an {{OutOfRangeException}} is thrown instead of returning an empty iterator. This violates the expected behavior of iterator pattern where empty collections should return empty iterators.
> *Test Case:*
> {code:java}
> RealVector v = create(new double[0]);
> Iterator<Entry> it = v.sparseIterator();// Throws OutOfRangeException {code}
>  



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