Re: matrix times a vector
- To: mathgroup at smc.vnet.net
- Subject: [mg49058] Re: matrix times a vector
- From: Paul Abbott <paul at physics.uwa.edu.au>
- Date: Tue, 29 Jun 2004 04:50:52 -0400 (EDT)
- Organization: The University of Western Australia
- References: <cbokn1$4bl$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
In article <cbokn1$4bl$1 at smc.vnet.net>,
David Salomon <david.salomon at csun.edu> wrote:
> Question:
>
> The input {{a,b}, {c,d}}.{x,y} generates the output {a x+b y,c
> x+d y}.
>
> How can I get the output x{a,b}+y{c,d} ?
By direct multiplication (note that . has been deleted):
{{a,b}, {c,d}} {x,y}
> This is a special case of lists with two elements. How
> can I extend this computation in an elegant way to lists
> with N elements?
This works with n elements:
{{a, b, c}, {c, d, e}, {e, f, g}, {f, g, h}} {x, y, t, u}
Cheers,
Paul
--
Paul Abbott Phone: +61 8 9380 2734
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