From Peter.Bosa at oregonmetro.gov  Tue Aug 22 16:39:50 2017
From: Peter.Bosa at oregonmetro.gov (Peter Bosa)
Date: Tue, 22 Aug 2017 14:39:50 +0000
Subject: [Rd] Possible repeat{} / break function bug in R 3.4.1
Message-ID: <1f22e392cb594b52ac3907d9f79992dd@MEX2.metro-region.org>

Hello, I've noticed the following error using repeat{} / break in R 3.4.1 running on Windows 10 and Windows Server 2008 (both 64-bit environments).

When running a repeat function, the break command causes an error message if the repeat command refers to code within a file, but does not produce an error if the code is contained within the repeat{} command.

For example, the following code runs fine:

x <- 1
y <- 5

repeat {
  if(x < y) {
    print("No Break Dance :-(")
    x = x + 1
  } else {
    print("Break Dance!")
    break
  }
}

[1] "No Break Dance :("
[1] "No Break Dance :("
[1] "No Break Dance :("
[1] "No Break Dance :("
[1] "No Break Dance :("
[1] "Break Dance!"
>

However, if I take the loop contents of the repeat{} function, and save them to a file (breakTest.R) that contains the following:

if(x < y) {
  print("No Break Dance :-(")
  x = x + 1
} else {
  print("Break Dance!")
  break
}

And then run the following code:

x <- 1
y <- 5

repeat{
  source("./breakTest.R")
}

I get the following error:

[1] "No Break Dance :("
[1] "No Break Dance :("
[1] "No Break Dance :("
[1] "No Break Dance :("
[1] "No Break Dance :("
[1] "Break Dance!"
Error in eval(ei, envir) : no loop for break/next, jumping to top level
>

This was not an issue with previous versions of R that I have used, including 3.3.3.

Any suggestions? Is this a known bug with 3.4.1?

Cheers-
Peter



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[Rd] Possible repeat{} / break function bug in R 3.4.1
Peter Bosa