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How to calculate derivative of a vector function

• To: mathgroup at smc.vnet.net
• Subject: [mg128775] How to calculate derivative of a vector function
• From: Li <mdeng1985 at gmail.com>
• Date: Sat, 24 Nov 2012 02:30:27 -0500 (EST)
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• Delivered-to: l-mathgroup@wolfram.com
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R'=v 
How to calculate derivative of
F=(R+b)/norm(R+b) in Mathematica where b is a constant vector
And how  to get the vector form of F'

Thanks a lot
Li