Re: Matrix
- To: mathgroup at smc.vnet.net
- Subject: [mg34851] Re: Matrix
- From: Peter <peter1963 at totalise.co.uk>
- Date: Sun, 9 Jun 2002 05:10:29 -0400 (EDT)
- References: <adsk2v$pnp$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Pirc wrote:
> If matrix A = ((1, 1) (1, 0)), Mathematica reports A * A as A.
>
> Shouldn't A * A = ((2, 1) (1, 0))?
>
> What am I missing?
>
> Thanks.
>
Hi Pirc,
the Operator * (Times) multiplies the (scalar) elements in corresponding
positions. What you've got is {{1*1,1*1},{1*1,0*0}}. For multiplication
of matrices use A.A (Dot[A,A]). This shoud give the expected result.
Peter