Direct product of matrices.

Hi Rene et al.,

Direct product of matrices which worked with HepMatrix does seem to work for TMatrix.

That is if I do

TMatrixD A(n,1);
then set a to some falues

TMatrixD B(n,n);
B=A*A.T()

it fails. Error message if about rows and columns not matching.

This worked with HepMatrix and is useful, for example, in constructing array of derivatives that enters some fits.

Is this a bug or a feature? Or am I doing something wrong?

It not hard to write my own direct product function but it looks ugly...

-Art S.

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