Hi, Michael et al.:
On 9/24/25 11:59, Michael Chirico wrote:
{ggplot2} has a number of data sets, you might read over their sources:
https://github.com/tidyverse/ggplot2/blob/main/R/data.R <https://
github.com/tidyverse/ggplot2/blob/main/R/data.R>
Thanks. I don't see anything there that is different from the example in
their book, which is extracted from the similar data.R file in their
tidyr package, which I reviewed earlier.[2]
I've deleted virtually everything else in that package and still get
that same error.
Suggestions?
Spencer Graves
p.s. I've done several web searches on this issue, found discussions on
StackOverflow that may have worked a few years ago, but roxygen2 seems
to have changes since then. I posted a similar question to
StackOverflow, that generated a few comments but nothing that seemed to
fix this problem. I reported an "issue" to the R Packages book on GitHub
last week, so far with nothing:
https://github.com/hadley/r-pkgs/issues/1106
I tried to use roxygen2 with a different project a year ago and gave up
after being unable to figure out how to use it. >
On Wed, Sep 24, 2025 at 5:48 AM Spencer Graves
<[email protected]
<mailto:[email protected]>> wrote:
Hello, All:
How does one document a dataset with roxygen2?
I've recently read Wickham and Bryan, R Packages (2e).[1] I've tried to
do what they say there, and R CMD check is reporting:
Variables with usage in Rd file 'MaddisonCountries.Rd' but not in
code:
‘MaddisonCountries’
This is in "https://github.com/sbgraves237/SS4Maddison <https://
github.com/sbgraves237/SS4Maddison>".
Suggestions? Thanks, Spencer Graves
p.s. Wickham and Bryan Section 7.1.2 says, "Objects in data/ are always
effectively exported .... . This means that they must be
documented. ...
[Y]ou document the name of the dataset and save it in R/. For example,
the roxygen2 block used to document the who data in tidyr is saved in
R/data.R ... . There are two roxygen tags that are especially important
for documenting datasets: @format ... @source
They give an example of a "who" dataset in tidyr. I've studied that
example without finding what I'm doing wrong.[2]
In addition, I need to specify Roygen and "LazyData: true" in
DESCRIPTION.
[1] Wickham and Bryan, R Packages online at:
https://r-pkgs.org/ <https://r-pkgs.org/>
Chapter 7 deals with Data:
https://r-pkgs.org/data.html <https://r-pkgs.org/data.html>
[2] "data.R" in tidyr is available at:
https://github.com/tidyverse/tidyr/blob/main/R/data.R <https://
github.com/tidyverse/tidyr/blob/main/R/data.R>
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