Re: What's wrong?
- To: mathgroup at smc.vnet.net
- Subject: [mg75334] Re: What's wrong?
- From: siewsk at bp.com
- Date: Wed, 25 Apr 2007 05:41:28 -0400 (EDT)
- References: <f0kbuc$r25$1@smc.vnet.net>
On the wikipedia page for Cross Product, it says
Magnitude[ A cross B ] = Magnitude[A] * Magnitude[B] * Sin[theta]
In spherical coordinates, the vector {0,1,0} has the magnitude of
ZERO.
Thus Magnitude[ A cross {0,1,0} ] = Magnitude[A] * ZERO * Sin[theta]
= ZERO
So when the resultant vector has a magnitude of ZERO, it's spherical
coordinates is {0,0,0}
Steven Siew
On Apr 24, 5:34 pm, "gogoan... at yahoo.com.hk" <gogoan... at yahoo.com.hk>
wrote:
> In[1]:=
> <<Calculus`VectorAnalysis`
>
> In[2]:=
> CrossProduct[{1,0,0},{0,1,0},Spherical]
>
> Out[2]=
> {0,0,0}
>
> Isn't the result supposed to be {0,0,1}, even in spherical
> coordinates?
>
> lion