[eigen] Sums

[Benjamin Schindler <bschindler@xxxxxxxxxxxxxxx>]

Hi

In my code, the following gets executed:

VectorXf grad_sum = kern2.rowwise().sum();

After executing, I noticed that the m_rows member is set to something 
really high, but kern2 is a 3xN Matrix, so the result should be a Vector 
of dimension 3
Is this intended or a bug?

Thanks
Benjamin

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