[S] use of deriv()

Nathan Pace (nlpace@bigpace.med.utah.edu)
Mon, 11 May 1998 08:49:56 +0000


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I am using the deriv() function to prepare an expectation function for use in
non linear modeling. My expectation function can be written fairly simply as
f(a, b, c, d, e, f, g).

In turn a, b, c, and d are functions of (w, x, y, z). I wish the resulting
function and derivative to be in terms of (w, x, y, z, e, f, g), but so
parametrized it will be a function with 50 to 100 terms - mostly w, x, y, z. I
would rather not have to explicitly write out f(w, x, y, z, e, f, g) and debug
all my typos.

I can easily define the assignments

a <- g(w, x, y, z)
b <- h(w, x, y, z)
c <- i(w, x, y, z)
d <- j(w, x, y, z)

How do I pass these assignments to deriv()?

Thanks

--
Nathan Leon Pace, M.D., Professor of Anesthesiology
University of Utah, Salt Lake City, Utah 84132
W: 801-581-6393                H: 801-467-2925
W: 801-581-4367 (FAX)          H: 801-467-0555 (FAX)
W: nlpace@bigpace.med.utah.edu H: nlpaces@sisna.com

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