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MathGroup Archive 2004

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Re: matrix times a vector

  • To: mathgroup at smc.vnet.net
  • Subject: [mg49065] Re: [mg49002] matrix times a vector
  • From: Gianluca Gorni <gorni at dimi.uniud.it>
  • Date: Wed, 30 Jun 2004 05:34:12 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

This seems to work in your example:

Transpose[{{a, b}, {c, d}}].{x, y}

Best regards,

             Gianluca Gorni

> On Jun 28, 2004, at 4:13 AM, David Salomon 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}  ?
>> 
>> 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?
>> 


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