Response to VectorAnalysis

*To*: MATHGROUP at christensen.cybernetics.net*Subject*: [mg238] Response to VectorAnalysis*From*: REECE_D <REECE+_D%A1%Electromagnetic_Sciences at mcimail.com>*Date*: Mon, 28 Nov 94 09:35 EST

Richard Chen wrote asking about VectorAnalysis and crossing two vectors in cylindrical space. The package as you presented it worked fine. {a1,a2,a3} x {0,0,1} is truly {Sqrt[(a1 Sin[a2])^2+...} Convert the cylindrical vectors to cartesian vectors to convince yourself. If you want {a1,a2,a3} x {0,0,1} = {a2,-a1,0}, you will need to do this cross product in cartesian space. Here is a follow on question regarding my understanding of VectorAnalysis. Does it convert vectors to cartesian vectors, perform the requested operation and then convert back? I'm wondering why the Sin^2+Cos^2 terms show up in the first component of Mr. Chen's operation. -Daryl Reece