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MathGroup Archive 2002

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Re: Row vs. Column Vectors (or Matrices)

  • To: mathgroup at smc.vnet.net
  • Subject: [mg33936] Re: Row vs. Column Vectors (or Matrices)
  • From: adam.smith at hillsdale.edu (Adam Smith)
  • Date: Tue, 23 Apr 2002 07:14:46 -0400 (EDT)
  • References: <aa05ug$25i$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

See if the following is what you want

In[1]:=
vector1 = {a,b,c}

Out[1]=
{a,b,c}

In[2]:=
vector2 = {c,d,e}

Out[2]=
{c,d,e}

In[3]:=
Outer[Times,vector1,vector2]

Out[3]=
{{a*c, a*d, a*e}, {b*c, b*d, b*e}, {c^2, c*d, c*e}}


In[4]:=
MatrixForm[Outer[Times,vector1,vector2]]

Note that MatrixForm is such a so-called wrapper that essentially just
changes the way things display on the screen.

It is not necessary to put the 2nd vector in a 1-column format due to
the construction of the Outer[] function.



John Resler <John-Resler at kscable.com> wrote in message news:<aa05ug$25i$1 at smc.vnet.net>...
> Hi,
>     I'm new to Mathematica and am doing a little linear algebra. I am 
> aware of the MatrixForm[m]
> function but I know of no way to create a row vector eg. [ 1.0  2.0  3.0 
> ] *   [ 1.0
>                                                                         
>                                                2.0
>                                                                         
>                                                3.0].
> 
> Can someone point me in the right direction? Thanks ahead of time.
> 
> -John


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