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From "Gilles (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MATH-626) Move RealVector.sparseIterator() to SparseRealVector
Date Wed, 10 Aug 2011 12:06:27 GMT

    [ https://issues.apache.org/jira/browse/MATH-626?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13082299#comment-13082299
] 

Gilles commented on MATH-626:
-----------------------------

Wouldn't it be an incompatible change? I'm referring to the title of this issue, not the various
other suggestions that should have been in their own JIRA requests.


> 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: 3.1
>
>
> 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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