Re: Curl

*To*: mathgroup at smc.vnet.net*Subject*: [mg34912] Re: [mg34875] Curl*From*: Vladimir Bondarenko <vvb at mail.strace.net>*Date*: Wed, 12 Jun 2002 02:16:04 -0400 (EDT)*Reply-to*: Vladimir Bondarenko <vvb at mail.strace.net>*Sender*: owner-wri-mathgroup at wolfram.com

Hello John, You put x and z too close, without a space between them. It is good way to say Derive you want multiply x by z. However, for Mathematica xz means a SINGLE variable. Compare: << Calculus`VectorAnalysis`SetCoordinates[Cartesian[x, y, z]]; Curl[{xz, yz, -y^2}] {-2 y, 0, 0} Curl[{x z, y z, -y^2}] {-3 y, x, 0} Regards, Vladimir Bondarenko