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MathGroup Archive 2007

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Re: Non-calculus vector math

  • To: mathgroup at smc.vnet.net
  • Subject: [mg75721] Re: [mg75668] Non-calculus vector math
  • From: DrMajorBob <drmajorbob at bigfoot.com>
  • Date: Wed, 9 May 2007 04:31:26 -0400 (EDT)
  • References: <9974391.1178620062660.JavaMail.root@m35>
  • Reply-to: drmajorbob at bigfoot.com

Does this help at all?

vectorForm[{a_, b_, c_}] :=
  a HoldForm[i] + b HoldForm[j] + c HoldForm[k]
{i, j, k} = IdentityMatrix[3];
(3 i + 6 j - 1 k) + 35 (1 i - 4 j + 5 k)
% // vectorForm
ReleaseHold[%]

{38, -134, 174}

38 i-134 j+174 k

{38, -134, 174}

Bobby

On Tue, 08 May 2007 04:52:39 -0500, David Rees  =

<w3bdevilREMOVE at THISw3bdevil.com> wrote:

> Ahoy,
>
> How can I perform elementary vector math in Mathematica? From what I'v=
e
> found, it's all Vector Calculus, but what about trivial/elementary vec=
tor
> math?
>
> Things like: "Particle A with position unit-vector of (3i+6j-1k) and
> velocity vector (1i-4j+5k)ms^-1 collides with Particle B 35 seconds af=
ter
> moving off from its initial position, where did it collide?"
>
> Thanks
>
>
>
>



-- =

DrMajorBob at bigfoot.com


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