[Rd] readLines function with R >= 3.5.0

[Ralf Stubner]

Dear all,

I would like to draw you attention to this question on SO:
https://stackoverflow.com/questions/50372043/readlines-function-with-new-version-of-r

Based on the OP's code I used the script

#######################################
create_matrix <- function() {
  cat("Write the numbers of vertices: ")
  user_input <- readLines("stdin", n=1)
  user_input <- as.numeric(user_input)
  print(user_input)
  }
create_matrix()
#######################################

and called it with "R -f ..." from the command line.

With 'R version 3.4.4 (2018-03-15) -- "Someone to Lean On"' the script
prints the inputed number as expected. With both 'R version 3.5.0
(2018-04-23) -- "Joy in Playing"' and 'R Under development (unstable)
(2018-05-19 r74746) -- "Unsuffered Consequences"' the script does not
continue after inputing a number.

All these tests where done using docker images from the rocker project,
i.e. effectively using Debian Linux.

Is this an error in the script or in R?

Thanks
Ralf

-- 
Ralf Stubner
Senior Software Engineer / Trainer

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