Message-ID: <CAPtbhHxcYBAA4jQ5dzc88GR7vZYN=J0ijxNvezr0bz+k2s7_ag@mail.gmail.com>
Date: 2012-12-31T10:11:53Z
From: Suzen, Mehmet
Subject: efficiently multiply different matrices in 3-d array with different vectors?
In-Reply-To: <1356895268.54965.YahooMailNeo@web142606.mail.bf1.yahoo.com>
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.