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https://issues.apache.org/jira/browse/MATH-870?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13906999#comment-13906999
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Gilles commented on MATH-870:
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bq. [...] matrix multiplication with a NaN that get not propagated or something
like that? What would this test bring?
It would keep track of known limitations; that it has been discussed and
accepted.
So that no user will open a bug report about NaNs being swallowed...
bq. [...] methods in OpenMapRealVector?
Yes. Line 376.
MATH-803 should thus be resolved differently from previously decided, as a
consequence of the decision to keep the implementation as is. Maybe other
similar issues initially delayed to 4.0 can be resolved now.
The partial workarounds should be removed since they don't bring any value,
knowing that nothing good can be expected once negative zero or NaN enter the
picture.
> 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: 4.0
> Reporter: 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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