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https://issues.apache.org/jira/browse/MATH-574?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13032469#comment-13032469
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Gilles commented on MATH-574:
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"ArrayRealVector" fixed in revision 1102356.
> 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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