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Posted to issues@commons.apache.org by "Luc Maisonobe (JIRA)" <ji...@apache.org> on 2011/05/09 20:02:03 UTC

[jira] [Commented] (MATH-570) Change some constructors of ArrayFieldVector to accept FieldVector

    [ https://issues.apache.org/jira/browse/MATH-570?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13030835#comment-13030835 ] 

Luc Maisonobe commented on MATH-570:
------------------------------------

The purpose of the large number of constructors is precisely to avoid spurious copies.
So I would consider their existence as a feature.

> Change some constructors of ArrayFieldVector to accept FieldVector
> ------------------------------------------------------------------
>
>                 Key: MATH-570
>                 URL: https://issues.apache.org/jira/browse/MATH-570
>             Project: Commons Math
>          Issue Type: Improvement
>    Affects Versions: 3.0
>            Reporter: Arne Plöse
>            Priority: Minor
>
> the constructor     public ArrayFieldVector(T[] v1, ArrayFieldVector<T> v2) {
>  ... 
> }
> takes an ArrayFieldVector.
> but the same can be easier archieved with this 
>     public ArrayFieldVector(T[] v1, FieldVector<T> v2) {
>         this(v1, v2 == null ? null : v2.getData());
>     }
> this goes for all other constructors...
> P.S. I donk know if copying the data in getData is an issue ... for this the named constructor may make sense...

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