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MathGroup Archive 2006

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Re: mathematica newbie question

  • To: mathgroup at smc.vnet.net
  • Subject: [mg66900] Re: mathematica newbie question
  • From: albert <awnl at arcor.de>
  • Date: Sat, 3 Jun 2006 03:25:26 -0400 (EDT)
  • References: <e5osv8$i51$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Jeremy Watts wrote:

> 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?
 
Yes, what you want is Dot (.) not Power(*), and x^2 maps to x*x for matrices
also. This does what you want:

m =  {0, 0, 0}, {1, -1, -1}, {-1, 1, 1}}
MatrixPower[x,2]

or:
m.m


hth,

albert



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