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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.     |

• Follow-Ups:
  • Re: matrix times a vector
    • From: Sseziwa Mukasa <mukasa@jeol.com>