Re: Wrong behavior of CrossProduct
- To: mathgroup at smc.vnet.net
- Subject: [mg7997] Re: Wrong behavior of CrossProduct
- From: Paul Abbott <paul at physics.uwa.edu.au>
- Date: Wed, 30 Jul 1997 23:57:50 -0400
- Organization: University of Western Australia
- Sender: owner-wri-mathgroup at wolfram.com
Sergio Rojas wrote:
> After playing a little bit with the Mathematica construction for the cross
> product of two vectors, implemented by the function CrossProduct of the
> package VectorAnalysis, I strongly believe that CrossProduct do not
> work properly on Mathematica ... *)
...
> In[1]:= Needs["Calculus`VectorAnalysis`"];
> In[2]:= SetCoordinates[Spherical[r,theta,phi]];
> In[3]:= V = {a1,a2,0};
> In[4]:= U = {0, 0, 1};
> In[5]:= CrossProduct[U,V]
> Out[5]= {0, 0, 0}
> (* Again, wrong result. Same results were obtained on *)
Why do you say this result is wrong? Your vector U={0, 0,
1}=={r,theta,phi} has zero length.
Cheers,
Paul
____________________________________________________________________
Paul Abbott Phone: +61-8-9380-2734
Department of Physics Fax: +61-8-9380-1014
The University of Western Australia
Nedlands WA 6907 mailto:paul at physics.uwa.edu.au
AUSTRALIA http://www.pd.uwa.edu.au/Paul
God IS a weakly left-handed dice player
____________________________________________________________________