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MathGroup Archive 2003

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Re: multiplying matrice rows

  • To: mathgroup at smc.vnet.net
  • Subject: [mg44302] Re: multiplying matrice rows
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Wed, 5 Nov 2003 10:00:26 -0500 (EST)
  • Organization: Universitaet Leipzig
  • References: <bo7o7e$af9$1@smc.vnet.net>
  • Reply-to: kuska at informatik.uni-leipzig.de
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

and

m = {{1, 2, 3}, {1, 2, 3}, {1, 2, 3}};
amatrix = {{a, b, c},
        {a, b, c},
       {a, b, c}}

MapAt[Dot[amatrix, #] &, m, {2}]

with correct postions in MapAt[] does not help?

Regards
  Jens

Dragutin Culinovic wrote:
> 
> How can I to multiply enumerated list of rows of an matrice on following
> way:
> To multyply each row (except rows a,b and c)of matrice A withe row a of
> the same matrice, and replace that row (not a row) with result.
> 
> rows b and c are last rows, row a is any row in the range 1->b(exclusive)
> 
> THX


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