[Rd] Suppressing a warning from library()

Prof Brian Ripley ripley at stats.ox.ac.uk
Wed Feb 24 18:39:29 CET 2010

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,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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