Re: How to mutiply a 3x1 and 1x3 vector
- Subject: [mg3098] Re: How to mutiply a 3x1 and 1x3 vector
- From: fjl0014 at ucs.usl.edu (Lombardo Fernando J)
- Date: 31 Jan 1996 04:04:15 -0600
- Approved: usenet@wri.com
- Distribution: local
- Newsgroups: wri.mathgroup
- Organization: Univ. of Southwestern La., Lafayette
- 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?
>
>thanks,
>
I had a similar problem. Try instead to define your vectors like:
A={{1,2,3}} and B={{3,4,5,}}. and then do Transpose[A].B
I think you will get a 3x3 matrix.
-Fernando fjl at usl.edu