Re: What's wrong?

*To*: mathgroup at smc.vnet.net*Subject*: [mg75312] Re: What's wrong?*From*: do.not at reply.nonet*Date*: Wed, 25 Apr 2007 05:29:43 -0400 (EDT)*Organization*: University Of Oxford, England*References*: <f0kbuc$r25$1@smc.vnet.net>

gogoant06 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 > > Lion Your second vector has a magnitude of zero, so it's OK. Try: CoordinatesToCartesian[{0,1,0},Spherical] As the help on (Dot, Cross, and Scalar Triple) Products says: "These functions convert the given vectors into Cartesian coordinates and then compute the products using the standard definitions." Robert