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Re: Matrix Expansion question to Mathgroup

• To: mathgroup at smc.vnet.net
• Subject: [mg47842] Re: Matrix Expansion question to Mathgroup
• From: Harold.Noffke at wpafb.af.mil (Harold Noffke)
• Date: Thu, 29 Apr 2004 00:34:41 -0400 (EDT)
• References: <c6d8m2$ji6$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

Larry:

Your question is not trivial, because what you have is a rank-3
tensor, and I was not able to get AppendRows and AppendColumns to work
for rank-3 tensors A and B in a simple programming example.  It is
obvious that each of your matrix elements are lists, and the only
lists you want affected by AppendRows and AppendColumns are the
outermost two -- i.e., in dimensions 1 and 2.

MathGroup ... Do we have packages available which extend AppendRows
and AppendColumns to tensors?

Regards,
Harold