[R] "deriv" and chain rule and matrix derivatives
Ahmad_Abu_Hammour/STUDENTS/FIRE%FIRE@fordham.edu
Ahmad_Abu_Hammour/STUDENTS/FIRE%FIRE at fordham.edu
Sat Feb 22 17:27:06 CET 2003
Hi,
Anybody knows if I can use "deriv" to implement CHAIN RULE AND MATRIX
derivation.
Simple examples:
y=expression(log(x))
z=expression (x*y)
deriv(z,"x") # chain rule
f=expression(det(x)) # where x is an (nxn) matrix
deriv(f, "x")
Is there any way to work around this?
Thank you very much.
Ahmad Abu Hammour
PS. by the way I tried to send the same email using my http-based account
hammour at msn.com, but I could not, although I set send email to plain text.
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