From dmurdoch@pair.com  Fri Sep 15 03:15:52 2000
From: dmurdoch@pair.com (Duncan Murdoch)
Date: Fri, 15 Sep 2000 02:15:52 GMT
Subject: [Rd] Projects
In-Reply-To: <87og1qlviu.fsf@jeeves.blindglobe.net>
References: <6rk8cfkmru.fsf@franz.stat.wisc.edu> <14785.241.670605.528570@gargle.gargle.HOWL> <873dj2ncf3.fsf@jeeves.blindglobe.net> <qxpaeda6fzk.fsf@verdi.stat.wisc.edu> <87og1qlviu.fsf@jeeves.blindglobe.net>
Message-ID: <39c38587.1708646@julian.uwo.ca>

On 14 Sep 2000 10:43:05 -0700, you wrote:

>Right, and it would be nice (necessary?) for testing and verification
>of the "symbolic" side of the package as well as for "drop-in" or
>"change a parameter" design functionality.  As well as being a
>starting point for the interface for the symbolicDeriv package.

I'm not sure if this is what Tony has in mind, but something I always
do when working with optimizers that take a supplied derivative is to
write a little numerical derivative routine to check that my calculus
and programming were done correctly.  Putting that into a single
function which took arguments just like the ones you pass to the
optimizer would be very convenient.

Duncan Murdoch
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[Rd] Projects
Duncan Murdoch