Mathematica 9 is now available
Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2004
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2004

[Date Index] [Thread Index] [Author Index]

Search the Archive

matrix times a vector

  • To: mathgroup at smc.vnet.net
  • Subject: [mg49002] matrix times a vector
  • From: David Salomon <david.salomon at csun.edu>
  • Date: Mon, 28 Jun 2004 04:13:46 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

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.     |


  • Prev by Date: Pattern Matching
  • Next by Date: AW: more question about plotting
  • Previous by thread: RE: Pattern Matching
  • Next by thread: Re: matrix times a vector