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MathGroup Archive 1998

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Differentiation ?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg14668] Differentiation ?
  • From: "Yves Gauvreau" <gauy at videotron.ca>
  • Date: Sat, 7 Nov 1998 02:10:25 -0500
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

I saw this equation in a book (Sum => greek SIGMA)

        Sum ei^2 = Sum (yi^2 - 2 mu yi + mu^2)

That easy to implement but there's this one

        D[ Sum ei^2, mu] = 2 Sum yi - 2 n mu

and this one to

        E'E = Y'Y - B'X'Y + B'X'XB

        D[E'E,B] = -2 X'Y + 2X'XB

the ' mean Transpose[]

How can I implement these type of Differenciation ?  Is it possible to
do that in Mathematica ?

Thanks
Yves






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