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https://issues.apache.org/jira/browse/MATH-875?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13471413#comment-13471413
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Sébastien Brisard commented on MATH-875:
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In {{r1395455}}, deprecated {{sparseIterator()}} in the {{RealVector}}
hierarchy, and replaced its use with {{iterator()}}.
> Deprecate RealVector.sparseIterator() and FieldVector.sparseIterator()
> ----------------------------------------------------------------------
>
> Key: MATH-875
> URL: https://issues.apache.org/jira/browse/MATH-875
> Project: Commons Math
> Issue Type: Improvement
> Affects Versions: 3.1, 4.0
> Reporter: Sébastien Brisard
> Priority: Minor
> Labels: linear, sparse
>
> Following MATH-870, {{RealVector.sparseIterator()}} and
> {{FieldVector.sparseIterator()}} have become useless. Their interface was
> confusing. Indeed, the Javadoc states
> {quote}
> Specialized implementations may choose to not iterate over all dimensions,
> either because those values are unset, or are equal to defaultValue(), or are
> small enough to be ignored for the purposes of iteration.
> {quote}
> The reference to {{defaultValue()}} (which does *not* exist) suggests that
> the interface offers the flexibility to chose the value which is not stored
> in the sparse implementation. On the other hand, "small enough to be ignored"
> suggests that this default value is zero.
> In version 3.1, this method will be deprecated, to be removed in 4.0.
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