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MathGroup Archive 1999

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Re: Don't want to calculate scalar product

  • To: mathgroup at smc.vnet.net
  • Subject: [mg19737] Re: Don't want to calculate scalar product
  • From: "Richard Finley" <rfinley at netdoor.com>
  • Date: Mon, 13 Sep 1999 02:41:03 -0400
  • References: <7ree45$489@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Toshi,

use the Mathematica function Outer...

regards,  RF


Toshiyuki (Toshi) Meshii wrote in message <7ree45$489 at smc.vnet.net>...
>Hi,
>
>I understand that one of the unique point of Mathematica is that you don't
>have to be conscious about whether a vector is a "row" or a "column"
vector.
>
>However, I think there is a case in which you have to specify whether you
>want Mathematica to recognize a vector as a row vector or a column vector.
>Let me explain my case.
>
>a={1,2,3}; b={4,5,6}
>
>I want to define "a" as a column vector (3x1 matrix) and "b" as a row
vector
>(1x3 matrix).
>
>I expect the product
> a.b
>as a 3x3 matrix, but the answer Mathematica gives is a scalar product "32".
>
>Please give me an advice to get the 3x3 matrix as a product.
>
>-Toshi
>
>
>



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