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Re: Partitioned matrix operations

  • To: mathgroup at smc.vnet.net
  • Subject: [mg100676] Re: Partitioned matrix operations
  • From: "Sjoerd C. de Vries" <sjoerd.c.devries at gmail.com>
  • Date: Wed, 10 Jun 2009 17:13:35 -0400 (EDT)
  • References: <h0l467$oof$1@smc.vnet.net>

Hi Joe,
As far as I know Mathematica doesn't have the possibility to declare a
variable to be a matrix, especially not with undefined dimensions. Of
course, you can define a matrix containing nxm symbolic elements (with
n,m known and defined) and work with that, but I don't think that's
what you want.

You might want to take a look at
http://www.math.washington.edu/~lee/Ricci/

Cheers -- Sjoerd

On Jun 9, 9:49 am, Joe Hays <hays.... at gmail.com> wrote:
> Hello,
> Here's a Mathematica newbie question. Say I have a matrix, M, defined as,
>
> M = {{A, B}, {C, 0}}
>
> where A is nxn, B is nxm, C is mxn, and the zero sum matrix is mxm. I wou=
ld
> like to perform an operation on the matrix M without fully defining A, B,
> and C and get a result in terms of A, B, and C. For example, if I wanted =
to
> determine the matrix inverse of M in terms of A, B, and C.
>
> Is this possible in Mathematica? I've unfortunately not found anything in
> the docs that indicates that this is possible.
>
> Thx.



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