So it has to do with Sweave. Following Sebastian's model, This vignette
produces the warning
\documentclass{article}
\usepackage{Sweave}
\begin{document}
\begin{Scode}
library("RMySQL")
library("RPostgreSQL")
\end{Scode}
\end{document}
but running the those lines in an R session does not. I think I will
re-phrase the issue and move it to R-devel.
Paul
On 12-09-18 02:58 PM, Sebastian P. Luque wrote:
On Tue, 18 Sep 2012 13:46:06 -0400,
Paul Gilbert <pgilbert...@gmail.com> wrote:
On 12-09-18 01:30 PM, Sebastian P. Luque wrote:
On Tue, 18 Sep 2012 11:40:26 -0400,
Paul Gilbert <pgilbert...@gmail.com> wrote:
I am doing some comparison for which I load both RMySQL and
RPostgreSQL from my own packages TSMySQL and TSPostgreSQL and I am
getting the following warning building a vignette. I think with
package namespaces / S4 definitions it is a bit difficult to
generate a self contained example, at least I have not yet managed
to do that, but I would appreciate any suggestions about what needs
to be done.
Loading required package: TSPostgreSQL Loading required package:
RPostgreSQL 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
I've seen this with a vignette using both the maptools and trip
packages, but it was just a warning and the vignette built just fine.
Yes, it is just a warning, and the vignette builds fine. It also looks
like there is probably a simple fix to remove the problem that causes
the warning, since that is what the warning suggests. However, as
Spencer pointed out, isolating a simple example is not so easy.
I had actually built such an example with those packages (available from
CRAN):
---<--------------------cut here---------------start------------------->---
\documentclass{article}
\usepackage{Sweave}
\begin{document}
<<load-packages>>=
library(maptools)
library(trip)
@
\end{document}
---<--------------------cut here---------------end--------------------->---
which produces the warnings:
---<--------------------cut here---------------start------------------->---
Warning in .simpleDuplicateClass(def, prev) :
A specification for class “owin” in package ‘trip’ seems equivalent to
one from package ‘maptools’ and is not turning on duplicate class definitions
for this class
Warning in .simpleDuplicateClass(def, prev) :
A specification for class “ppp” in package ‘trip’ seems equivalent to one
from package ‘maptools’ and is not turning on duplicate class definitions for
this class
Warning in .simpleDuplicateClass(def, prev) :
A specification for class “psp” in package ‘trip’ seems equivalent to one
from package ‘maptools’ and is not turning on duplicate class definitions for
this class
---<--------------------cut here---------------end--------------------->---
Both packages have the same definitions for these classes. A quick
search on this warning points to
https://stat.ethz.ch/pipermail/r-devel/2011-July/061628.html, which
suggests that adding an importClassesFrom() directive in NAMESPACE and
removing the class definition from one of the packages, might solve
this. A dependency may be needed though...
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