Dear List,
I use Rgraphviz for display of graphs in some packages. Since Rgraphviz is no
longer on CRAN it needs to be installed from Bioconductor and that is fine, but
I have trouble figureing out the following: I create a plot method which - if
Rgraphviz is installed - uses Rgraphviz for displaying and otherwise does
nothing. This is implemented as:
if (!("package:Rgraphviz" %in% search())){
if("Rgraphviz" %in% installed.packages()){
require(Rgraphviz)
} else {
cat("The Rgraphviz package (from Bioconductor) must be installed to
display the models\n")
return()
}
}
... else go on and do the plotting...
When I run rcmd check packagename (on Windows XP, using R.2.7.1) I get
* checking for unstated dependencies in R code ... WARNING
'library' or 'require' calls not declared from:
Rgraphviz
See the information on DESCRIPTION files in the chapter 'Creating R
packages' of the 'Writing R Extensions' manual.
I can not state Rgraphviz in the Depends-field of the DESCRIPTION file because
then the package does not pass the windows checks for going on CRAN. I can not
see any solution from "writing R extensions", but I apologize if I have
overlooked it. Does anyone have a suggestion on what to do?
Cheers
Søren
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