Re: matrix times a vector
- To: mathgroup at smc.vnet.net
- Subject: [mg49038] Re: matrix times a vector
- From: "Steve Luttrell" <steve_usenet at _removemefirst_luttrell.org.uk>
- Date: Tue, 29 Jun 2004 04:50:18 -0400 (EDT)
- References: <cbokn1$4bl$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
You need to omit the "dot" operator from your expression:
{{a, b}, {c, d}}{x, y}
gives
{{a x, b x}, {c y, d y}}
This also generalises to the N component case.
Steve Luttrell
"David Salomon" <david.salomon at csun.edu> wrote in message
news:cbokn1$4bl$1 at smc.vnet.net...
> 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} ?
>
> 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?
>
> with thanks,
>
>
> |David Salomon
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