[R] efficiently multiply different matrices in 3-d array with different vectors?

[Suzen, Mehmet]

On 30 December 2012 20:21, arun <smartpink111 at yahoo.com> wrote:
> HI,
> I was not aware of the algebraic relationship.
> Tx for the explanation.

For the record; the simple example I have shown can be reproduced with
Einstein's summation rule as well. While A and x tensors have
covariant (lower) indices *only*.
So using %r%  may make sense only if we have contravariant (upper)
indices as well (mixed-variant).
Just to clarify my previous post to avoid any confusion.