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MathGroup Archive 2006

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Re: mathematica newbie question

  • To: mathgroup at smc.vnet.net
  • Subject: [mg66895] Re: [mg66879] mathematica newbie question
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Sat, 3 Jun 2006 03:25:13 -0400 (EDT)
  • Reply-to: hanlonr at cox.net
  • Sender: owner-wri-mathgroup at wolfram.com

mat=Array[a,{3,3}];

mat^2==(#^2&/@mat)

True

mat.mat==MatrixPower[mat, 2]

True


See Help for MatrixPower


Bob Hanlon

---- Jeremy Watts <jwatts1970 at hotmail.com> 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?
> 
> Thanks
> 
> 

--

Bob Hanlon
hanlonr at cox.net


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