How to create a matrix?

• Subject: How to create a matrix?
• From: Gray Calhoun
• Date: Tue, 14 Feb 2006 11:20:23 -0800

Hi,

  I'm working with terms like "transpose(X) . X" where X is an
unspecified n-by-p matrix.  How can I define a matrix X without
specifying the terms x_ij?  I invert X'X and take derivatives of terms
like X . b with respect to b (b is a p-by-1 vector), and would like to
keep everything in matrix notation.  I didn't find this in the
documentation; is there another resource that I should look at?

I'm using xMaxima 5.9.2 on windows XP.

--
Gray Calhoun

Economics Department
UC San Diego

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