rmd pdf output fails with data.tree example

[DrXyzzy]

1. Enter the following example program for data.tree in R:

   output: pdf_document

   library(data.tree)
   
   acme <- Node$new("Acme Inc.")
     accounting <- acme$AddChild("Accounting")
       software <- accounting$AddChild("New Software")
       standards <- accounting$AddChild("New Accounting Standards")
     research <- acme$AddChild("Research")
       newProductLine <- research$AddChild("New Product Line")
       newLabs <- research$AddChild("New Labs")
     it <- acme$AddChild("IT")
       outsource <- it$AddChild("Outsource")
       agile <- it$AddChild("Go agile")
       goToR <- it$AddChild("Switch to R")
   
   plot(acme)

2. No output is produced and log shows (or other error):

   processing file: dtree2.rmd
   Quitting from lines 6-21 (dtree2.rmd)
   Error in (function (url = NULL, file = "webshot.png", vwidth = 992, vheight = 744,  :
     webshot.js returned failure value: -6
   Calls:  ... html_screenshot -> in_dir -> do.call -> 
   Execution halted
   

3. Change output format in prologue to "html_output" and html output tab shows correct output.

Reported by Chad Worley.

[haraldschilly]

Hmm, interesting. Well, this could be really hard to fix, because it's maybe an upstream issue. In any case, good to know it works one way but not the PDF way.

[DrXyzzy]

And FWIW the jupyter notebook version works.