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https://issues.apache.org/jira/browse/MATH-870?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13464079#comment-13464079
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Sébastien Brisard commented on MATH-870:
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In {{r1390684}}, deprecated {{SparseRealVector}} and {{OpenMapRealVector}}.
> Deprecate interfaces and implementations of sparse vectors and matrices
> -----------------------------------------------------------------------
>
> Key: MATH-870
> URL: https://issues.apache.org/jira/browse/MATH-870
> Project: Commons Math
> Issue Type: Improvement
> Affects Versions: 3.1, 4.0
> Reporter: Sébastien Brisard
> Assignee: Sébastien Brisard
> Priority: Minor
>
> Recently, many problems have been found out with class
> {{OpenMapRealVector}} (see MATH-803 and MATH-821), to the point that the
> complete removal of this class in upcoming versions (as of 4.0) has been
> agreed [markmail|http://markmail.org/thread/bseyswf7qqrgatru].
> Since it now becomes useless, {{SparseRealVector}} will also be removed. For
> the sake of consistency, {{SparseFieldVector}} will also be removed.
> Furthermore, it is expected that the same kind of bugs will occur with sparse
> implementations of real/field matrices, which will also be removed.
> In version 3.1, the following classes and interfaces will be deprecated
> * {{SparseRealVector}}
> * {{OpenMapRealVector}}
> * {{SparseFieldVector}}
> * {{SparseRealMatrix}}
> * {{OpenMapRealMatrix}}
> * {{SparseFieldMatrix}}
> They will be completely removed in version 4.0.
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