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
|                                                                         |
> |Computer Science Dept.                     dsalomon at csun.edu        |
> |California State University                http://www.ecs.csun.edu/~dxs
|
> |Northridge, CA 91330-8281                  (818) 677-4954
|
> |USA                                        fax (818) 677-7208
|
> |
|
> |            Macintosh --- because you can see right through windows.
|
>

```

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