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