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MathGroup Archive 1998

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Re: Vectors

  • To: mathgroup at
  • Subject: [mg13921] Re: [mg13894] Vectors
  • From: BobHanlon at
  • Date: Mon, 7 Sep 1998 01:22:47 -0400
  • Sender: owner-wri-mathgroup at


Check your input.

Bob Hanlon

A = {a1, a2, a3}; B = {b1, b2, b3};

Cross[A, B]

{a2 b3-a3 b2,a3 b1-a1 b3,a1 b2-a2 b1}

Cross[A, B] == -Cross[B, A]


Cross[A, A]


In a message dated 9/6/98 6:59:57 AM, ogeorg at wrote:

>I want to do symbolic calculation with vectors, in particular, I want to
>do a vector product.  But if I declare:
>   A = (a b c)
>and do
>   A x A
>(which should give zero), but instead I get:
>   Cross::"nonn1": "Not all of the arguments are vectors 
>   of required length
>since there's no way for mathematica to know that a, b and c represent
>numerical value and not functions or lists. Is there a way around to
>perform this kind of calculation ?

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