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Re: matrix algebra

• To: mathgroup at smc.vnet.net
• Subject: [mg3699] Re: [mg3683] matrix algebra
• From: Robert Pratt <rpratt at math.unc.edu>
• Date: Mon, 8 Apr 1996 02:05:56 -0400
• Sender: owner-wri-mathgroup at wolfram.com

Sometimes partitioned matrices are called block matrices, and that's what 
Mma calls them.  Check out BlockMatrix in the standard package 
LinearAlgebra`MatrixManipulation`

Rob Pratt
Department of Mathematics
The University of North Carolina at Chapel Hill
CB# 3250, 331 Phillips Hall
Chapel Hill, NC  27599-3250

rpratt at math.unc.edu

On Fri, 5 Apr 1996, Juan Garcia Velo wrote:

> Does anybody know of a package of functions and operators that can deal
> with partitioned matrices? Example: 
> mat_a = [ a b ]    mat_b = [ d c ]
>         [ c d ]            [ b a ]
> where a, b, c, d are matrices (although not necessarily defined) of
> appropriate dimensions. Then I can do MULT[mat_a,mat_b] and get
> mat_c = [ a d + b b    a c + b a ]
>         [ c d + d b    c c + d a ]
> without any attempt of changing the order in the products defining the
> elements of mat_c, because they are matrices, obviously.
> 
> I already explored the wolfram web site and didn't find anything.
> Thanks,
> 
> Juan
> 
> -- 
> Juan Garcia-Velo                                     garciajb at ucunix.san.uc.edu
> Aerospace Engineering, ML 70
> University of Cincinnati                       My .sig file does not accurately
> Cincinnati, OH 45221, USA                      reflect the owner's creativity.
> 
> 


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