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.