[Rd] interrupting Sweave leaves open sink connection

Michael Sumner mdsumner at gmail.com
Wed Oct 23 03:45:06 CEST 2013

Hello, if I interrupt Sweave while it's processing a file it seemingly
leaves an open sink connection that hides printed output.

Can this be changed to reset the sink on exit?  I've been baffled by
this for years.

This is seen in Windows (R Under development (unstable) (2013-10-20
r64082))  and an older Linux (R version 3.0.0 (2013-04-03)).

Run the code below in two parts with a manual interrupt to 1) to see it.

Cheers, MIke.

## 1)

## this code creates a temporary file to run Sweave

## interrupt this code before Sweave() finishes

txt <-  c("\\documentclass[a4paper]{article}", "\\title{Sweave bail out}",
"\\author{M. Sumner}", "\\begin{document}", "\\maketitle", "",
"Run a loop and bail out when Sweave()ing.", "", "<<>>=",
"for (i in seq_len(1e6)) {", "    if (i %% 1000 == 0)
print(sprintf(\"%i\", i))",
"    Sys.sleep(0.5)", "}", "@", "", "\\end{document}")

f <- tempfile()
writeLines(txt, f)


## 2)
## now no printed output is seen


## now it's back
## [1] 1

## tidy up
## unlink(f)

Michael Sumner
Hobart, Australia
e-mail: mdsumner at gmail.com

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