       Re: col-vector * row-vector = matrix, how ?

• To: mathgroup at smc.vnet.net
• Subject: [mg18573] Re: [mg18451] col-vector * row-vector = matrix, how ?
• From: "Mark E. Harder" <harderm at ucs.orst.edu>
• Date: Tue, 13 Jul 1999 01:01:18 -0400
• Sender: owner-wri-mathgroup at wolfram.com

```Malte;
This works:

MatrixForm[Outer[Times,{a,b,c},{x,y,z} ] ]

Note that Outer[Times... is just an outer product of two lists.  The concept
of column-  versus row- vectors is irrelevant, but the outer product is not
commutative.

-mark harder

-----Original Message-----
From: Malte Lance <malte.lance at gmx.net>
To: mathgroup at smc.vnet.net
Subject: [mg18573] [mg18451] col-vector * row-vector = matrix, how ?

>Need to know how to accomplish the following in Mathematica-3.0:
>
>v1 := transpose(<a,b,c>)   /* column-vector */
>
>v2 := <x,y,z>              /* row-vector */
>
>( ax ay az )
>( bx by bz ) = v1 * v2 =: m /* 3x3-matrix */
>( cx cy cz )
>
>Does anyone know how to do this in Mathematica ?
>
>Any help is highly appreciated.
>
>Malte.
>
>--
>Malte Lance.
>--- composed with knews
>

```

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