[Rd] data() in data/*.R files
ligges at statistik.uni-dortmund.de
Mon Nov 29 12:34:30 CET 2004
Robin Hankin wrote:
> I'm having difficulty making a package pass R CMD check.
> I need to read in a dataset from another package, modify it, and have the
> modified object available in the first package. help(require) says:
> The source code for a package that requires one or more other
> packages should have a call to 'require', preferably near the
> beginning of the source, and of course before any code that uses
> functions, classes or methods from the other package.
> and 200update.txt points out that the data/*.R files must be self
> sufficient, suggesting "require(pkg, quietly=TRUE, save=FALSE)"
> if needed. My .R file in the data subdirectory looks like this:
> require(calibrator, quietly=TRUE, save=FALSE)
> data(expert.estimates, package="calibrator")
> expert.estimates.modified <- some.function(expert.estimates)
> But if I do this, R CMD check says
> Error in eval(expr, envir, enclos) : couldn't find function "data"
> Execution halted
> ERROR: installing package indices failed
> Installation failed.
> [the package passes R CMD check if I cut-and-paste a dput and assign
> directly, and dispense with the data() statement].
> How do I load a dataset from another package in a .R file, and use it?
You need to require(utils) (the package data() is in),
as well as a corresponsing entry in the DESCRIPTION file.
Also, for Windows, you may need to add the line
to your DESCRIPTION file, but I am not sure about the latter (and
haven't tested yet).
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