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From Sébastien Brisard (JIRA) <j...@apache.org>
Subject [jira] [Commented] (MATH-626) Move RealVector.sparseIterator() to SparseRealVector
Date Tue, 31 Jul 2012 05:50:39 GMT

    [ https://issues.apache.org/jira/browse/MATH-626?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13425545#comment-13425545
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Sébastien Brisard commented on MATH-626:
----------------------------------------

See also this recent [discussion|http://markmail.org/thread/l5d3f2ap4apjukbk].
                
> Move RealVector.sparseIterator() to   SparseRealVector
> ------------------------------------------------------
>
>                 Key: MATH-626
>                 URL: https://issues.apache.org/jira/browse/MATH-626
>             Project: Commons Math
>          Issue Type: Improvement
>            Reporter: Arne Plöse
>            Priority: Minor
>             Fix For: 4.0
>
>
> Having this method available for all is not very efficient, because if I want use this
feature I must check for interface SparseRealVector.
> otherwise different implementations could be faster. 
> I.e. no array clone and the assigning all values again.
> Maybe one could add a menthod fillstate() to SparseRealVector to guide which is faster
- use array clone and then sparseIterator or just create the array and then fill it up.
> To reduce confusion a second Interface ArrayRealVector with the method getDataRef() and
removing getData() from RealVector would be nice - there is a toArray() this should be sufficient.


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