Re: [Rd] problem with vignettes when S4 classes in packages overlap

[Paul Gilbert]

On 12-09-18 07:23 PM, Duncan Murdoch wrote:
On 12-09-18 5:40 PM, Paul Gilbert wrote:

( A similar problem is also reported by Sebastian P. Luque with
    library(maptools)
    library(trip)
in the vignette as below ).

I am writing a vignette which loads RMySQL and RPostgreSQL. This
produces the warning:

Loading required package: DBI
Warning in .simpleDuplicateClass(def, prev) :
    A specification for class “dbObjectId” in package ‘RPostgreSQL’ seems
equivalent to one from package ‘RMySQL’ and is not turning on duplicate
class definitions for this class

This can be reproduced by running
    R CMD Sweave --pdf Atest.Stex

where the file Atest.Stex has the lines

\documentclass{article}
\usepackage{Sweave}
\begin{document}
\begin{Scode}
library("RMySQL")
library("RPostgreSQL")
\end{Scode}
\end{document}

These warnings only happen in a vignette. They are not produced if the
lines are entered in an R session.

(Using R version 2.15.1 (2012-06-22) -- "Roasted Marshmallows" on Ubunt

You'll get the warning in a regular session if you set options(warn=1).
  I think Sweave is probably doing this so that warnings show up around
the time of the chunk they correspond to.  It does it in the command
line version, but not in the Sweave() function (which would save them up
to the end).

I don't know if the warning is something you should worry about or not.

It doesn't interfere with producing the vignette, but for submitting to 
CRAN it is better not to have warnings coming from my package, even 
though they are caused by a problem with other packages. Now that I know 
why it only happens in the vignette, I guess I can suppress it (but it 
would be nice to see the other packages fixed).

Thanks,
Paul

Duncan Murdoch

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