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Matrices-in-functions question

• To: mathgroup at smc.vnet.net
• Subject: [mg20417] Matrices-in-functions question
• From: "Aram Schiffman" <aram at sirius.com>
• Date: Tue, 26 Oct 1999 00:33:03 -0400
• Organization: Posted via Supernews, http://www.supernews.com
• Sender: owner-wri-mathgroup at wolfram.com

Here is a simple one, but I can't work it out.

I would like to be able to define a function this way:

z=mat[[1]][[1]] a + mat[[1]][[2]]

without specifying what "mat" is explicitly. I would evaluate it later this
way:

z/.mat->somePredefinedMatrix

Of course, Mathematica complains about the definition (Part specification mat[[1]] is
longer than depth of object) ... is there a way to make this fly?

Thanks,
Aram Schiffman