Re: Dealing with submatrices

• To: mathgroup at smc.vnet.net
• Subject: [mg18149] Re: [mg18099] Dealing with submatrices
• From: BobHanlon at aol.com
• Date: Fri, 18 Jun 1999 00:51:48 -0400
• Sender: owner-wri-mathgroup at wolfram.com

```Chris,

M1 = { {m111, m112, m113}, {m121, m122, m123}, {m131, m132, m133}};
M2 = { {m211, m212, m213}, {m221, m222, m223}, {m231, m232, m233}};
M3 = { {m311, m312, m313}, {m321, m322, m323}, {m331, m332, m333}};
M4 = { {m411, m412, m413}, {m421, m422, m423}, {m431, m432, m433}};
M5 = { {m511, m512, m513}, {m521, m522, m523}, {m531, m532, m533}};
M6 = { {m611, m612, m613}, {m621, m622, m623}, {m631, m632, m633}};
M7 = { {m711, m712, m713}, {m721, m722, m723}, {m731, m732, m733}};
M8 = { {m811, m812, m813}, {m821, m822, m823}, {m831, m832, m833}};
M9 = { {m911, m912, m913}, {m921, m922, m923}, {m931, m932, m933}};
M = Partition[Flatten[{{M1, M2, M3}, {M4, M5, M6}, {M7, M8, M9}}], 9]

Bob Hanlon

In a message dated 6/17/99 6:26:39 PM, chall at aoe.vt.edu writes:

>I want to construct a 9x9 matrix using 9 existing 3x3 matrices:
>M = { {m11, m12, m13}, {m21, m22, m23}, {m31, m32, m33}}
>
>The problem is that this creates a too-deep nested list and I can't
>figure out how
>to make it a 9x9.  Flatten doesn't appear to be the right tool.
>

```

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