R Package unable to access contents from `inst` folder

Asked May 23 '18 at 13:43

Active May 23 '18 at 18:06

Viewed 45 times

Update

Fixed it

  x <- tolower(name)
  sysloc <- system.file(package="RanglaPunjab")
  x <- paste (sysloc,"/img/",x,".jpg", sep="")
  jj <- readJPEG(x,native=TRUE)
  plot(0:1,0:1,type="n",ann=FALSE,axes=FALSE)
  rasterImage(jj,0,0,1,1)

I created R package according to this tutorial

From what I understand, folder inst will include all the files verbatim in final package. I included directory img with all the photos that ShowPalettePhoto(name) should display

R package is located on GitHub, https://github.com/ArtieLadie/RanglaPunjab

Below is photo of System Files directory (after installing package on my machine)

img folder is in same level as R. Function ShowPalettePhoto(name) accesses the jpg with following command.

  x <- paste ("./img/",x,".jpg", sep="")
  jj <- readJPEG(x,native=TRUE)
  plot(0:1,0:1,type="n",ann=FALSE,axes=FALSE)
  rasterImage(jj,0,0,1,1)

Where am I going wrong?

Error in readJPEG(x, native = TRUE) : unable to open ./img/teej.jpg

edited May 23 '18 at 18:06

asked May 23 '18 at 13:43

Artie Ladie

The "." in the path would be the "current working directory" of you R session. Not the package. Use the `system.file()` function to get files from your package. – MrFlick May 23 '18 at 14:13
It is a basic misunderstanding on your part. _Everything in `inst/` becomes installed "as-is"_ but without the `inst/` layer. See the duplicate I marked. – Dirk Eddelbuettel May 23 '18 at 14:13
Trying this out .... will keep you posted – Artie Ladie May 23 '18 at 17:31
Fixed it , see updated question – Artie Ladie May 23 '18 at 18:05

R Package unable to access contents from `inst` folder

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