12 Jan 1998 08:49:53 -0600
Wenyaun Xi <email@example.com> writes to S-news:
> I ran into some problems when I tried to get symbolic derivation by
> using a function deriv3(). The expression contains 18
> parameters, of which I want to have an information matrix eventually. I
> ran it on my 200MHz Pentium PC with 64meg RAM. Each time I kick out the
> job, the S-plus 3.1 for Windows stops after about 2 hour of real time
> and suggests that it requires more memory(size varies each time) in
> addition to those already in use. I don't know if this is a memory related
> problem or there is a whole different issue involved here other than the
May I suggest sending a message on this to Rfirstname.lastname@example.org?
I am sending a cc: of this message to that group.
R is a freely available language that behaves like S but has a
fundamentally different underlying implementation. It is possible
that your problem that causes difficulty in S will be easier to run in
R. The issues are probably memory related and R does "garbage
collection" but S does not. Also, deriv in R is implemented in the
underlying C code rather than in the S code.
If you want to install R yourself you can check the CRAN
(Comprehensive R Archive Network) sites. One close to you is
Otherwise, you could post the call to deriv3() that you are trying to
evaluate to the R-devel list and someone could try to run it for you.
Douglas Bates email@example.com
Statistics Department 608/262-2598
University of Wisconsin - Madison http://www.stat.wisc.edu/~bates/
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