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