[R] "deriv" and chain rule and matrix derivatives

[Ahmad_Abu_Hammour/STUDENTS/FIRE%FIRE]

   Hi,
   Anybody knows if I c= an use "deriv" to implement CHAIN RULE AND
   MATRIX
   derivation.
   Simple examples:
   y=expression(log(x))
   z=express= ion (x*y)
   deriv(z,"x") # chain rule
   f=expression(det(x)) # where x is an (nxn) matrix
   deriv(f, "x")
   Is ther= e any way to work around this?
   Thank you ver= y much.
   Ahmad Abu Hammour
   PS. by the way I tried to send the same email using my http-ba= sed
   account [EMAIL PROTECTED], but I could not, although I set send email to
   = plain text.______________________________________________
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