R help - Jun 2016 - import of data set and warning from R CMD check

Hi all,

When checking an R package, I get:

|Consider adding importFrom("datasets","CO2")

(this data set is used in some example code)

However, when I add the suggested 'importFrom' statement to NAMESPACE 
(using roxygen2), I get
|
|Error :object ?CO2? is not exported by 'namespace:datasets'|
||
|I understand that datasets are not exported, and the comment printed by 
'R CMD check' seems not to have any consequences, but it nevertheless 
seems inconsistent to me. But maybe I miss something here...

Pascal

|

-- 

Dr. Pascal A. Niklaus
Department of Evolutionary Biology and Environmental Studies
University of Zurich
Winterthurerstrasse 190
CH-8057 Zurich / Switzerland


||||

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Dear Pascal,

You could try to use data(CO2, package = "datasets") instead of
data(CO2)

Best regards,

ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature and
Forest
team Biometrie & Kwaliteitszorg / team Biometrics & Quality Assurance
Kliniekstraat 25
1070 Anderlecht
Belgium

To call in the statistician after the experiment is done may be no more
than asking him to perform a post-mortem examination: he may be able to say
what the experiment died of. ~ Sir Ronald Aylmer Fisher
The plural of anecdote is not data. ~ Roger Brinner
The combination of some data and an aching desire for an answer does not
ensure that a reasonable answer can be extracted from a given body of data.
~ John Tukey

2016-06-17 17:45 GMT+02:00 Pascal A. Niklaus <pascal.niklaus at
ieu.uzh.ch>:
> Hi all,
>
> When checking an R package, I get:
>
> |Consider adding importFrom("datasets","CO2")
>
> (this data set is used in some example code)
>
> However, when I add the suggested 'importFrom' statement to
NAMESPACE
> (using roxygen2), I get
> |
> |Error :object ?CO2? is not exported by 'namespace:datasets'|
> ||
> |I understand that datasets are not exported, and the comment printed by
> 'R CMD check' seems not to have any consequences, but it
nevertheless
> seems inconsistent to me. But maybe I miss something here...
>
> Pascal
>
> |
>
> --
>
> Dr. Pascal A. Niklaus
> Department of Evolutionary Biology and Environmental Studies
> University of Zurich
> Winterthurerstrasse 190
> CH-8057 Zurich / Switzerland
>
>
> ||||
>
>         [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
	[[alternative HTML version deleted]]

Dear Thierry,

Thanks, that indeed solved the warning.

Still, I think the message from R CMD check is confusing since the hint 
seems not to work with the current R version.

Pascal

On 2016-06-21 11:31, Thierry Onkelinx wrote:
> Dear Pascal,
>
> You could try to use data(CO2, package = "datasets") instead of
data(CO2)
>
> Best regards,
>
> ir. Thierry Onkelinx
> Instituut voor natuur- en bosonderzoek / Research Institute for Nature
> and Forest
> team Biometrie & Kwaliteitszorg / team Biometrics & Quality
Assurance
> Kliniekstraat 25
> 1070 Anderlecht
> Belgium
>
> To call in the statistician after the experiment is done may be no more
> than asking him to perform a post-mortem examination: he may be able to
> say what the experiment died of. ~ Sir Ronald Aylmer Fisher
> The plural of anecdote is not data. ~ Roger Brinner
> The combination of some data and an aching desire for an answer does not
> ensure that a reasonable answer can be extracted from a given body of
> data. ~ John Tukey
>
> 2016-06-17 17:45 GMT+02:00 Pascal A. Niklaus <pascal.niklaus at
ieu.uzh.ch
> <mailto:pascal.niklaus at ieu.uzh.ch>>:
>
>     Hi all,
>
>     When checking an R package, I get:
>
>     |Consider adding importFrom("datasets","CO2")
>
>     (this data set is used in some example code)
>
>     However, when I add the suggested 'importFrom' statement to
NAMESPACE
>     (using roxygen2), I get
>     |
>     |Error :object ?CO2? is not exported by 'namespace:datasets'|
>     ||
>     |I understand that datasets are not exported, and the comment printed
by
>     'R CMD check' seems not to have any consequences, but it
nevertheless
>     seems inconsistent to me. But maybe I miss something here...
>
>     Pascal
>
>     |
>
>     --
>
>     Dr. Pascal A. Niklaus
>     Department of Evolutionary Biology and Environmental Studies
>     University of Zurich
>     Winterthurerstrasse 190
>     CH-8057 Zurich / Switzerland
>
>