Render a reprex

Run a bit of R code using rmarkdown::render(). The goal is to make it easy to share a small reproducible example ("reprex"), e.g., in a GitHub issue. Reprex source can be

  • read from clipboard

  • read from current selection or active document ("Render reprex" RStudio addin)

  • provided directly as expression, character vector, or string

  • read from file

The usual "code + commented output" is returned invisibly, put on the clipboard, and written to file. An HTML preview displays in RStudio's Viewer pane, if available, or in the default browser, otherwise. Leading "> " prompts, are stripped from the input code.

reprex(x = NULL, venue = c("gh", "so", "r", "R"), si = FALSE,
  show = TRUE, input = NULL, outfile = NULL, comment = "#>",
  opts_chunk = NULL, opts_knit = NULL)

An expression. If not given, reprex() looks for code in input or on the clipboard, in that order.


"gh" for GitHub (default), "so" for StackOverflow, "r" or "R" for a runnable R script, with commented output interleaved.


Whether to include the results of devtools::session_info(), if available, or sessionInfo() at the end of the reprex. When venue = "gh" (the default), session info is wrapped in a collapsible details tag.


Whether to show rendered output in a viewer (RStudio or browser). Defaults to TRUE.


Character. If has length one and lacks a terminating newline, interpreted as the path to a file containing reprex code. Otherwise, assumed to hold reprex code as character vector (length greater than one) or string (with embedded newlines).


Optional basename for output files. When NULL (default), reprex writes to temp files below the session temp directory. If outfile = "foo", expect output files in current working directory, like foo_reprex.R,, and, if venue = "R", foo_rendered.R. If outfile = NA, expect output files in current working directory with basename derived from the path in input, if sensible, otherwise from tempfile().


Character. Prefix with which to comment out output, defaults to "#>".

opts_chunk, opts_knit

Named list. Optional knitr chunk and package options, respectively, to supplement or override reprex defaults. See Details.


reprex sets specific knitr options, which you can supplement or override via the opts_chunk and opts_knit arguments or via explicit calls to knitr in your reprex code (see examples). If all you want to override is the comment option, use the dedicated argument, e.g.commment = "#;-)".

  • Chunk options default to collapse = TRUE, comment = "#>", error = TRUE. These are options you normally set via knitr::opts_chunk$set(). Note that error = TRUE, because a common use case is bug reporting.

  • Package options default to = knitr::imgur_upload. These are options you normally set via knitr::opts_knit$set(). The defaults to imgur_upload so figures produced by the reprex appear properly on GitHub.


Character vector of rendered reprex, invisibly.

  • reprex
# put some code like this on the clipboard
# (y <- 1:4)
# mean(y)

# provide code as an expression
reprex(rbinom(3, size = 10, prob = 0.5))
reprex({y <- 1:4; mean(y)})

# note that you can include newlines in those brackets
# in fact, that is probably a good idea
  x <- 1:4
  y <- 2:5
  x + y

## provide code via character vector
reprex(input = c("x <- 1:4", "y <- 2:5", "x + y"))

## if just one line, terminate with '\n'
reprex(input = "rnorm(3)\n")

## customize the output comment prefix
reprex(rbinom(3, size = 10, prob = 0.5), comment = "#;-)")

# override a default chunk option, in general
reprex({(y <- 1:4); median(y)}, opts_chunk = list(collapse = FALSE))
# the above is simply shorthand for this and produces same result
  #+ setup, include = FALSE
  knitr::opts_chunk$set(collapse = FALSE)

  #+ actual-reprex-code
  (y <- 1:4)

# add prose, use general markdown formatting
  #' # A Big Heading
  #' Look at my cute example. I love the
  #' [reprex]( package!
  y <- 1:4

# read reprex from file
writeLines(c("x <- 1:4", "mean(x)"), "foofy.R")
reprex(input = "foofy.R")

# read from file and write to similarly-named outfiles
reprex(input = "foofy.R", outfile = NA)
list.files(pattern = "foofy")
file.remove(list.files(pattern = "foofy"))

# write rendered reprex to file
  x <- 1:4
  y <- 2:5
  x + y
}, outfile = "foofy")
list.files(pattern = "foofy")
file.remove(list.files(pattern = "foofy"))

# write reprex to file AND keep figure local too, i.e. don't post to imgur
  #' Some prose
  ## regular comment
  (x <- 1:4)
  }, outfile = "blarg", opts_knit = list( = identity))
list.files(pattern = "blarg")
unlink(list.files(pattern = "blarg"), recursive = TRUE)

## target venue = StackOverflow
ret <- reprex({
  x <- 1:4
  y <- 2:5
  x + y
}, venue = "so")

## target venue = R, also good for email or Slack snippets
ret <- reprex({
  x <- 1:4
  y <- 2:5
  x + y
}, venue = "R")

## include prompt and don't comment the output
## use this when you want to make your code hard to execute :)
  x <- 1:4
  y <- 2:5
  x + y
}, opts_chunk = list(comment = NA, prompt = TRUE))

## leading prompts are stripped from source
reprex(input = c("> x <- 1:3", "> median(x)"))
# }
# }
Documentation reproduced from package reprex, version 0.1.2, License: MIT + file LICENSE

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