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Re: Matrix Differentiation

  • To: mathgroup at smc.vnet.net
  • Subject: [mg85917] Re: Matrix Differentiation
  • From: dh <dh at metrohm.ch>
  • Date: Wed, 27 Feb 2008 04:34:28 -0500 (EST)
  • References: <fq0uav$kab$1@smc.vnet.net>


Hi Mark,

you got what you asked for. The syntax you used gives the gradient, see 

the manual. What you want is written as:

D[M,x1,x2,x3,x4]

hope this helps, Daniel



mark wrote:

> Hi all,

> 

> I need to differentiate a 4x4 matrix M with respect to four variables

> x1,x2,x3 and x4.

> 

> I have tried to use the function D as follows:

> 

> D[M,{{x1,x2,x3,x4}}]

> 

> what I get is a 4x4 matrix and each term in this matrix is a vector.

> 

> Am I right when I used this function or there is another function to

> do so?

> 

> Thanks

> 




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