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Re: *newbie* output of ScalarTripleProduct

  • To: mathgroup at smc.vnet.net
  • Subject: [mg106774] Re: *newbie* output of ScalarTripleProduct
  • From: Simon <simonjtyler at gmail.com>
  • Date: Sat, 23 Jan 2010 07:32:30 -0500 (EST)
  • References: <hjbvbk$2st$1@smc.vnet.net>

On Jan 22, 6:40 pm, pippo <marco.... at email.it> wrote:
> I'm (almost) new to mathematica ...
> I coped this from some tutorial ...
>
> Needs["VectorAnalysis`"]
> r1 = {1, -3, 2}
> r2 = {3, 7,-5}
> r3 = {4, 1, 6}
> r={x,y,z}
> ScalarTripleProduct[r-r1,r2-r2,r3-r1]==0
>
> the output i get is:
> Out[6]= True
>
> :-(
>
> What am I missing ?
>
> Thank you

I like easy questions...  and so does everyone else - I bet you'll get
about 15 replies.
Here's my answer:

r2-r2={0,0,0}

So of course the result will be zero.

Simon


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