[Rd] Projects
A.J. Rossini
rossini@blindglobe.net
14 Sep 2000 10:43:05 -0700
>>>>> "SD" == Saikat DebRoy <saikat@stat.wisc.edu> writes:
>>>>> "AJR" == A J Rossini <rossini@blindglobe.net> writes:
>>>>> "MM" == Martin Maechler <maechler@stat.math.ethz.ch> writes:
MM> 2) For Computer Scientists : "Differentiation" / Symbolic
MM> derivatives,..
MM> Improve the possibilities of D() and deriv(), and document
MM> them. Make these user-extensible.
MM> Think about the hessian in addition to the gradient.
AJR> Even automating/specifications for numerical derivatives
AJR> would be nice.
SD> The nls package has a function called numericDeriv - with a
SD> little modification it could be used elsewhere. An earlier
SD> version of the underlying C code is used as an example in the
SD> R Extensions manual.
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.
best,
-tony
--
A.J. Rossini Rsrch. Asst. Prof. of Biostatistics
BlindGlobe Networks (home/default) rossini@blindglobe.net
UW Biostat/Center for AIDS Research rossini@u.washington.edu
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