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Topic: how to calculate derivative of vector functions
Replies: 1   Last Post: Nov 23, 2012 4:25 PM

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Nasser Abbasi

Posts: 5,694
Registered: 2/7/05
Re: how to calculate derivative of vector functions
Posted: Nov 23, 2012 4:25 PM
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On 11/23/2012 11:08 AM, mdeng1985@gmail.com wrote:
> Hi, If R'=v
> How to calculate derivative of
> F=(R+b)/norm(R+b) in Mathematica where b is a constant vector
> How to get the vector form of F'
>
> Thanks a lot
> Li
>


You mean something like this (in 2D space)

-----------------------------
r = {Cos[t], Sin[t]};
b = {1, 2};
f = (r + b)/Norm[r + b];
D[f, t]
---------------------------

ps. it is not good idea to use single UpperCase variables in
Mathematica. Also, variable names and functions names should
start with lowerCase letters.

--Nasser



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