I am having problems with R crashing when I optimize complex
likelihoods with nlm. I have about 1500 observations and some very
nonlinear PKPD models with up to 28 parameters using various
distributions.
  With the standard memory size, I get the occasional core dump of
about 29mb. If I up memory to -n288000 and -v5, the dumps seem
somewhat rarer but are larger: 34mb. They occur both with 0.49 and
0.16.1 although I have primarily been using the former.
  They are two extra uncontrolled factors: I have a new portable and
have installed the latest Red Hat Linux 2.0.27. (The latter, for X
windows,
 is very much less
stable than my old Slackware a.out Linux 1.2.13!!!) The portable has a
Pentium 133 that gets very warm when doing such hard work.

 Any ideas? Jim
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