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Dealing with submatrices


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.

Thank you,
Chris
-----
Christopher D. Hall                    (540) 231-2314
Aerospace and Ocean Engineering        (540) 231-9632 (fax)
Virginia Tech                          http://www.aoe.vt.edu/~chall
Blacksburg VA 24061-0203



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