[R] Genuine relative paths with R

[Olivier GIVAUDAN]

Dear Eik,

Thank you for your message.

Yes, I already got to know this package and this discussion (while I found the 'here' package). But thanks.

Best regards,

Olivier
________________________________
De : Eik Vettorazzi <E.Vettorazzi using uke.de>
Envoy� : lundi 8 octobre 2018 11:30
� : Olivier GIVAUDAN; r-help using r-project.org
Objet : Re: [R] Genuine relative paths with R

Dear Olivier,
you may find the rprojroot package useful, see
https://github.com/r-lib/rprojroot

and a discussion

https://gist.github.com/jennybc/362f52446fe1ebc4c49f#file-2014-10-12_stop-working-directory-insanity-md

Cheers

Am 06.10.2018 um 13:48 schrieb Olivier GIVAUDAN:
> Dear R users,
>
> I would like to work with genuine relative paths in R for obvious reasons: if I move all my scripts related to some project as a whole to another location of my computer or someone else's computer, if want my scripts to continue to run seamlessly.
>
> What I mean by "genuine" is that it should not be necessary to hardcode one single absolute path (making the code obviously not "portable" - to another place - anymore).
>
> For the time being, I found the following related posts, unfortunately never conclusive or even somewhat off-topic:
> https://stackoverflow.com/questions/1815606/rscript-determine-path-of-the-executing-script
> https://stackoverflow.com/questions/47044068/get-the-path-of-current-script/47045368
> http://r.789695.n4.nabble.com/Script-auto-detecting-its-own-path-td2719676.html
>
> So I found 2 workarounds, more or less satisfactory:
>
>
>    1.  Either create a variable "ScriptPath" in the first lines of each of my R scripts and run a batch (or shell, etc.) to replace every single occurrence of "ScriptPath <-" by "ScriptPath <- [Absolute path of the R script]" in all the R scripts located in the folder (and possibly subfolders) of the batch file.
>    2.  Or create an R project file with RStudio and use the package "here" to get the absolute path of the R project file and put all the R scripts related to this project in the R project directory, as often recommended.
>
> But I am really wondering why R doesn't have (please tell me if I'm wrong) this basic feature as many other languages have it (batch, shell, C, LaTeX, SAS with macro-variables, etc.)?
> Do you know whether the language will have this kind of function in a near future? What are the obstacles / what is the reasoning for not having it already?
>
> Do you know other workarounds?
>
> Best regards,
>
> Olivier
>
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>
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--
Eik Vettorazzi

Department of Medical Biometry and Epidemiology
University Medical Center Hamburg-Eppendorf

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20246 Hamburg

Phone: +49 (0) 40 7410 - 58243
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