On Wed, 24 Feb 2010, Terry Therneau wrote:

I get a warning about "1 warning message" using R CMD check on the
survival library.  It comes from the code snippet:

  if (library(cmprsk, logical.return=TRUE)) {
        # further test of competing risks from survfit
        .
        .
        }
This is a very useful additional test when I'm checking any changes to
the affected code, so I like having this in my test suite even though it
doesn't run automatically.

This argues for a change in library -- when the user sets logical.return
=T they don't need a warning message too.

It was the considered opinion that in general they do. You can always use suppressWarnings() in your code if you don't, or you can pre-check that the package is available via lower-level functions such as .packages and .find.package.

I submit this to the R core and their collective wisdom.

I admit that mine is an unusual case, and for now I'll turn if off with
options(warn=-1)

Terry T.

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Brian D. Ripley,                  rip...@stats.ox.ac.uk
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