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 UbuntYou'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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