[Rd] Mysterious behavior

From: Therneau, Terry M., Ph.D. <therneau_at_mayo.edu>
Date: Fri, 09 Jul 2010 09:55:40 -0500

I had trouble with some tests for the survival suite last night that I cannot explain.

Framework: Ubuntu Linux, R2.11.

   For testing survival I have a separate directory and Makefile. I pull everything into the local .RData, no packages, library, or namespace. (It's easier to add test modifications to a routine in a chain of calls).    

   A test of survreg + psline would fail because splines is not automatically loaded in this scenario. In my console window type

> library(splines)

      > fit <- survreg(Surv(time, status) ~ ph.ecog + spline(age), data=lung)
as the first 2 lines a a new session (the lung data is also saved) and up would pop an error message about having <2.10 version of survival. And it is true that I had such a thing in my ~/RLib. But
there is no mention of either the local or the system survival library when I type search(), and .Autoloaded is NULL.

  I'm mystified as to how R decided to use that library, and what it was trying to pull from it. I removed it from ~/Rlib and the message went away, but now I'm not so sure that this was a good idea. Is something now being automatically snatched out of the standard survival library? If so that compromises the integrity of my testbed. How do I find out?

Terry Therneau

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