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Re: Do I have to worry about "Left" division for matrices?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg94098] Re: Do I have to worry about "Left" division for matrices?
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Fri, 5 Dec 2008 05:28:02 -0500 (EST)
  • Organization: Uni Leipzig
  • References: <gh8hoh$r4h$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de

Hi,

if Mathematica would make a difference between row and column vectors
yes. Otherwise not.

AFAIK Mathematica implements none of the operators and it depend
on you to make the decision. Since b/A with a matrix would do a 
component wise division and that is not what you want.

Regards
   Jens

Tyler wrote:
> Hello All:
> 
> I am currently in the process of rewriting some old code into
> Mathematica. One of the things I've come across is the matrix
> operation
> 
> A \ b
> 
> Which is defined as "left division." In other words (if I have this
> right):
> 
> A \ b = inv(A)*b
> 
> and "right division" is
> 
> b / A = b*inv(A)
> 
> I guess my question is, does mathematica make the distinction between
> left and right division, or is this more or less related to the
> algorithm used by the solver (I am using numerical values by the way,
> and not a symbolic solution)?
> 
> Cheers,
> 
> t.
> 


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