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Gilles commented on MATH574:

"SparseFieldVector" fixed in revision 1104575.
> Remove the restriction that the two vectors in RealVector.outerProduct have to be of
the same size.
> 
>
> Key: MATH574
> URL: https://issues.apache.org/jira/browse/MATH574
> 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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