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MathGroup Archive 1996

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Re: How to mutiply a 3x1 and 1x3 vector

  • Subject: [mg3092] Re: How to mutiply a 3x1 and 1x3 vector
  • From: wagner at bullwinkle.cs.Colorado.EDU (Dave Wagner)
  • Date: 31 Jan 1996 04:08:38 -0600
  • Approved: usenet@wri.com
  • Distribution: local
  • Newsgroups: wri.mathgroup
  • Organization: University of Colorado, Boulder
  • Sender: daemon at wri.com

In article <4ekes6$6gj at dragonfly.wri.com>,
Stephen Nichols <snichols at onramp.net> wrote:
>
>Hi,
>
>I have another question that I thought would be simple to to in Mathematica.
>I have two vectors A={1,2,3} and B={3,4,5}.  How do I multiple them together
>to get a 3x3 matrix.  A . B gives me a scalar result.  Mma seems to always
>treat the first one as a row vector and the second as a column vector.  I
>need it to do the opposite.  Treat the first as a column vector and the second
>as a row vector.  Any ideas?

Express your column vector as a 3x1 matrix, and your row vector as
a 1x3 matrix:

 In[1]:=
    {{1},{2},{3}}.{{3,4,5}}
 Out[1]=
    {{3, 4, 5}, {6, 8, 10}, {9, 12, 15}}


		Dave Wagner
		Principia Consulting
		(303) 786-8371
		dbwagner at princon.com
		http://www.princon.com/princon


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