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MathGroup Archive 2006

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Re: mathematica newbie question

  • To: mathgroup at smc.vnet.net
  • Subject: [mg66896] Re: mathematica newbie question
  • From: "ben" <benjamin.friedrich at gmail.com>
  • Date: Sat, 3 Jun 2006 03:25:14 -0400 (EDT)
  • References: <e5osv8$i51$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi Jeremy,

matrix multiplication can be component-wise
(A^2,A*B,...), OR
be a matrix multiplication in the genuine sense
(A.B, MatrixPower[A,2], ...).

Bye Ben

> Hi,
>
> Just trying to get to grips with Mathematica and matrices.  Why is it when I
> enter :-
> {0, 0, 0}, {1, -1, -1}, {-1, 1, 1}}^2
>
> then Mathematica returns :-
>
> {{0, 0, 0}, {1, 1, 1}, {1, 1, 1}}
>
> and not {{0,0,0},{0,0,0},{0,0,0}} (the actual square of the matrix) as I'd
> have expected?
>
> Is it treating what I entered as separate vectors or something, and not  an
> actual matrix?
> 
> Thanks


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