[R-pkg-devel] txt data is undefined global variable

[Uwe Ligges]

On 16.01.2019 17:00, Thierry Onkelinx wrote:
> Dear all,
> 
> I'm working on a package "foo" which has a dataframe stored in
> "data/foo.txt". The DESCRIPTION has "LazyData: true".  Functions can use
> the object "foo". e.g.

foo is not regisrered in the namespace and you are relying on search 
path order now.

If you want to have data objects you want to use in functions but which 
are not necesarily available via data() calls, use the sysdata 
mechanism. From WRE:

"if the R subdirectory contains a file sysdata.rda (a
saved image of one or more R objects: please use suitable compression as 
suggested by tools::resaveRdaFiles, and see also the 
‘SysDataCompression’ DESCRIPTION field.) this will be lazy-loaded into 
the namespace environment – this is intended for system datasets that 
are not intended to be user-accessible via data"

Best,
Uwe Ligges

> bar <- function() {
> summary(foo)
> }
> 
> However, R CMD check throws the "undefined global variable" error.
> 
> What is the proper way to use txt data in a package?
> 
> Best regards,
> 
> Thierry
> 
> ir. Thierry Onkelinx
> Statisticus / Statistician
> 
> Vlaamse Overheid / Government of Flanders
> INSTITUUT VOOR NATUUR- EN BOSONDERZOEK / RESEARCH INSTITUTE FOR NATURE AND
> FOREST
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