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Date: Tue, 17 May 2011 21:39:47 +0000 (UTC)
From: "Gilles (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (MATH-574) Remove the restriction that the two
 vectors in RealVector.outerProduct have to be of the same size.
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    [ https://issues.apache.org/jira/browse/MATH-574?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13035078#comment-13035078 ] 

Gilles commented on MATH-574:
-----------------------------

"SparseFieldVector" fixed in revision 1104575.


> Remove the restriction that the two vectors in RealVector.outerProduct have to be of the same size.
> ---------------------------------------------------------------------------------------------------
>
>                 Key: MATH-574
>                 URL: https://issues.apache.org/jira/browse/MATH-574
>             Project: Commons Math
>          Issue Type: Improvement
>    Affects Versions: 2.2, 3.0
>         Environment: All.
>            Reporter: Emile Ben Nasatyr
>            Priority: Minor
>              Labels: matrix, vector
>             Fix For: 3.0
>
>   Original Estimate: 24h
>  Remaining Estimate: 24h
>
> Currently RealMatrix M = x.outerProduct(y) throws an exception if x and y are different sizes. This is as documented  in the Javadoc but not what one expects mathematically (see e.g. http://en.wikipedia.org/wiki/Outer_product) - the vectors can be any size.
> So please remove the restriction that the vectors should be the same size, as this doesn't seem to be necessary either mathematically or in terms of the implementation.

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