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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