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How to construct a matrix like this ?

• To: mathgroup at smc.vnet.net
• Subject: [mg50895] How to construct a matrix like this ?
• From: zhoukm at hotmail.com
• Date: Sun, 26 Sep 2004 05:32:12 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

With Array[a, {2,2}] I can get an array like:
| a[1,1] a[1,2] |
| a[2,1] a[2,2] |.
But occasionally I want matrix like:
| a11 a12 |
| a21 a22 |
I remember I once figured out a way to do it but now I forgot. Anyone
can give me a hand?

Regards