In skranz/RTutor: Interactive R problem sets with automatic testing of solutions and automatic hints

knitr::opts_chunk$set(eval=FALSE, cache=FALSE)

verbatimize.chunks = function() {
  # Make chunks verbatim as explained here
  # https://yihui.name/knitr/faq/ 
  # Point 7

  library(stringtools)
  setwd("D:/libraries/RTutor/RTutor/vignettes")
  file = "test.Rmd"
  txt = readLines(file)
  lines = which(str.starts.with(trimws(txt), "```{r") & !str.ends.with(trimws(txt),"`r ''`"))[-1]
  txt[lines] = paste0(txt[lines],"`r ''`")
  writeLines(txt, file)
}

Sneaky errors that might occur when developing a problem set

• Problem: When running create.ps the following error message appears Error in nchar(paste0(code, collapse = "\n")) : invalid multibyte string, element 1

• Answer: This is a nasty error that has to do with the encoding of your text file. Try the following with your _sol.Rmd file. In RStudio choose the menu File -> Reopen with encoding. Then pick the Encoding UTF-8 and press ok. Now make some small changes in your file, save it and try again to run create.ps. Hopefully it now works...

• Problem: After changing the _sol.Rmd file and runing create.ps and show.ps, the browser opens but the changes do not appear in the shown problem set.

• Answer: Make sure that you have correctly set the working directory with setwd to the folder in which your _sol.Rmd file is stored.

skranz/RTutor documentation built on Feb. 7, 2024, 12:53 a.m.