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Re: Derivative of a funtion evaluated at a point in 3D

• To: mathgroup at smc.vnet.net
• Subject: [mg44468] Re: Derivative of a funtion evaluated at a point in 3D
• From: mroc_1000 at hotmail.com (mroc)
• Date: Mon, 10 Nov 2003 19:55:53 -0500 (EST)
• References: <boign7$oj1$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

mroc_1000 at hotmail.com (mroc) wrote in message news:<boign7$oj1$1 at smc.vnet.net>...
> Hello, I am totally new to Mathematica and trying to program a simple
> FEM-type problem. I am trying to take the partial derivative
> (symbolically) of an expression that is a function of four points in
> 3D. All I can think of to do is F[p1,p2,p3,p4] = stuff then
> D[F,p1,p2,p3,p4] . But I keep getting a zero expression as a result.
> (where stuff is a nasty combination of these points) Any thoughts?

Anyone? What am I missing? Is this question too easy or too hard?

• Follow-Ups:
  • Re: Re: Derivative of a funtion evaluated at a point in 3D
    • From: christopherpurcell <christopherpurcell@mac.com>
  • Re: Re: Derivative of a funtion evaluated at a point in 3D
    • From: Andrzej Kozlowski <akoz@mimuw.edu.pl>