How to use VectorAnalysis package?

*To*: mathgroup at christensen.cybernetics.net*Subject*: [mg225] How to use VectorAnalysis package?*From*: Richard Q. Chen <chen at fractal.eng.yale.edu>*Date*: Wed, 23 Nov 94 14:11:19 EST

Hi, I have some problems using the vector analysis package. The following shows a typical session: Mathematica 2.2 for Solaris Copyright 1988-93 Wolfram Research, Inc. -- Open Look graphics initialized -- In[1]:= Needs["Calculus`VectorAnalysis`"] In[2]:= SetCoordinates[Cylindrical[]] Out[2]= Cylindrical[r, theta, z] In[3]:= a={a1,a2,a3} Out[3]= {a1, a2, a3} In[4]:= n={0,0,1} Out[4]= {0, 0, 1} In[5]:= CrossProduct[a,n] 2 2 2 2 Out[5]= {Sqrt[a1 Cos[a2] + a1 Sin[a2] ], > ArcTan[a1 Sin[a2], -(a1 Cos[a2])], 0} Since I already set cooridinate to be cylindrical, I suppose a={a1,a2,a3} means that a1 is the r-component, a2 theta- component and a3 z-component. But Mma seems not doing this. What I want is that CrossProduct[a,n] gives {a2,-a1,0} How to do this? Thanks for any info. Richard