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Posted to issues@commons.apache.org by "Gilles (JIRA)" <ji...@apache.org> on 2011/05/18 00:20:47 UTC

[jira] [Resolved] (MATH-574) Remove the restriction that the two vectors in RealVector.outerProduct have to be of the same size.

     [ https://issues.apache.org/jira/browse/MATH-574?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gilles resolved MATH-574.
-------------------------

    Resolution: Fixed

Revision 1104600.


> 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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