R devel - Aug 2015 - capture.output() duplicates last line unless newline (R-devel bug)

In R-devel (2015-08-12 r69024), capture.output() incorrectly
duplicates the last line unless it ends with a newline.  I don't see
this in R 3.2.2 RC (2015-08-13 r69049).  It seems to have started
fairily recently; I spotted this yesterday after starting to get
errors in my R.utils check that use capture.output(), cf.
https://www.r-project.org/nosvn/R.check/r-devel-linux-x86_64-debian-clang/R.utils-00check.html

Examples:
> x <- "a"
> cat(x)
a>
> capture.output(cat(x))
[1] "a" "a"
> x <- "a\n"
> cat(x)
a
> capture.output(cat(x))
[1] "a"
> x <- "a\nb"
> cat(x)
a
b>
> capture.output(cat(x))
[1] "a" "b" "b"
> x <- "a\nb\n"
> cat(x)
a
b
> capture.output(cat(x))
[1] "a" "b"
> capture.output(cat(x))
[1] "a" "b"
> x <- c("a", "b")
> cat(x)
a b>
> capture.output(cat(x))
[1] "a b" "a b"
> x <- c("a", "b\n")
> cat(x)
a b
> capture.output(cat(x))
[1] "a b"

> sessionInfo()
R Under development (unstable) (2015-08-12 r69024)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 7 x64 (build 7601) Service Pack 1

locale:
[1] LC_COLLATE=English_United States.1252
[2] LC_CTYPE=English_United States.1252
[3] LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C
[5] LC_TIME=English_United States.1252

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

other attached packages:
[1] R.utils_2.1.0-9000     R.oo_1.19.0-9000       R.methodsS3_1.7.0-9000

loaded via a namespace (and not attached):
[1] tools_3.3.0

/Henrik

But it was changed over 24h ago in R-devel, 2 commits later ....

See e.g. https://cran.r-project.org/bin/windows/base/rdevel.html for 
when not to report on 'R (Under Development)' (and you really should 
have known that, as a Windows user).

On 14/08/2015 10:09, Henrik Bengtsson wrote:
> In R-devel (2015-08-12 r69024), capture.output() incorrectly
> duplicates the last line unless it ends with a newline.  I don't see
> this in R 3.2.2 RC (2015-08-13 r69049).  It seems to have started
> fairily recently; I spotted this yesterday after starting to get
> errors in my R.utils check that use capture.output(), cf.
>
https://www.r-project.org/nosvn/R.check/r-devel-linux-x86_64-debian-clang/R.utils-00check.html
>
> Examples:
>
>> x <- "a"
>> cat(x)
> a>
>> capture.output(cat(x))
> [1] "a" "a"
>
>> x <- "a\n"
>> cat(x)
> a
>> capture.output(cat(x))
> [1] "a"
>
>> x <- "a\nb"
>> cat(x)
> a
> b>
>> capture.output(cat(x))
> [1] "a" "b" "b"
>
>> x <- "a\nb\n"
>> cat(x)
> a
> b
>> capture.output(cat(x))
> [1] "a" "b"
>
>> capture.output(cat(x))
> [1] "a" "b"
>> x <- c("a", "b")
>> cat(x)
> a b>
>> capture.output(cat(x))
> [1] "a b" "a b"
>
>> x <- c("a", "b\n")
>> cat(x)
> a b
>> capture.output(cat(x))
> [1] "a b"
>
>
>> sessionInfo()
> R Under development (unstable) (2015-08-12 r69024)
> Platform: x86_64-w64-mingw32/x64 (64-bit)
> Running under: Windows 7 x64 (build 7601) Service Pack 1
>
> locale:
> [1] LC_COLLATE=English_United States.1252
> [2] LC_CTYPE=English_United States.1252
> [3] LC_MONETARY=English_United States.1252
> [4] LC_NUMERIC=C
> [5] LC_TIME=English_United States.1252
>
> attached base packages:
> [1] stats     graphics  grDevices utils     datasets  methods   base
>
> other attached packages:
> [1] R.utils_2.1.0-9000     R.oo_1.19.0-9000       R.methodsS3_1.7.0-9000
>
> loaded via a namespace (and not attached):
> [1] tools_3.3.0
>
> /Henrik

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Emeritus Professor of Applied Statistics, University of Oxford
1 South Parks Road, Oxford OX1 3TG, UK

The fix for PR#16481 had a side effect involving capture.output(), so this may
be transient, please recheck whether the issue has disappeared in the meantime.

-pd

On 14 Aug 2015, at 11:09 , Henrik Bengtsson <henrik.bengtsson at ucsf.edu>
wrote:
> In R-devel (2015-08-12 r69024), capture.output() incorrectly
> duplicates the last line unless it ends with a newline.  I don't see
> this in R 3.2.2 RC (2015-08-13 r69049).  It seems to have started
> fairily recently; I spotted this yesterday after starting to get
> errors in my R.utils check that use capture.output(), cf.
>
https://www.r-project.org/nosvn/R.check/r-devel-linux-x86_64-debian-clang/R.utils-00check.html
> 
> Examples:
> 
>> x <- "a"
>> cat(x)
> a>
>> capture.output(cat(x))
> [1] "a" "a"
> 
>> x <- "a\n"
>> cat(x)
> a
>> capture.output(cat(x))
> [1] "a"
> 
>> x <- "a\nb"
>> cat(x)
> a
> b>
>> capture.output(cat(x))
> [1] "a" "b" "b"
> 
>> x <- "a\nb\n"
>> cat(x)
> a
> b
>> capture.output(cat(x))
> [1] "a" "b"
> 
>> capture.output(cat(x))
> [1] "a" "b"
>> x <- c("a", "b")
>> cat(x)
> a b>
>> capture.output(cat(x))
> [1] "a b" "a b"
> 
>> x <- c("a", "b\n")
>> cat(x)
> a b
>> capture.output(cat(x))
> [1] "a b"
> 
> 
>> sessionInfo()
> R Under development (unstable) (2015-08-12 r69024)
> Platform: x86_64-w64-mingw32/x64 (64-bit)
> Running under: Windows 7 x64 (build 7601) Service Pack 1
> 
> locale:
> [1] LC_COLLATE=English_United States.1252
> [2] LC_CTYPE=English_United States.1252
> [3] LC_MONETARY=English_United States.1252
> [4] LC_NUMERIC=C
> [5] LC_TIME=English_United States.1252
> 
> attached base packages:
> [1] stats     graphics  grDevices utils     datasets  methods   base
> 
> other attached packages:
> [1] R.utils_2.1.0-9000     R.oo_1.19.0-9000       R.methodsS3_1.7.0-9000
> 
> loaded via a namespace (and not attached):
> [1] tools_3.3.0
> 
> /Henrik
> 
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
-- 
Peter Dalgaard, Professor,
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Office: A 4.23
Email: pd.mes at cbs.dk  Priv: PDalgd at gmail.com

Thanks for the updates.  I'm glad it was taken care of.  I would
normally have waited, but I wanted to bring this up asap in case there
was a risk for it to enter R 3.2.2.

/Henrik

On Fri, Aug 14, 2015 at 11:30 AM, peter dalgaard <pdalgd at gmail.com>
wrote:
> The fix for PR#16481 had a side effect involving capture.output(), so this
may be transient, please recheck whether the issue has disappeared in the
meantime.
>
> -pd
>
> On 14 Aug 2015, at 11:09 , Henrik Bengtsson <henrik.bengtsson at
ucsf.edu> wrote:
>
>> In R-devel (2015-08-12 r69024), capture.output() incorrectly
>> duplicates the last line unless it ends with a newline.  I don't
see
>> this in R 3.2.2 RC (2015-08-13 r69049).  It seems to have started
>> fairily recently; I spotted this yesterday after starting to get
>> errors in my R.utils check that use capture.output(), cf.
>>
https://www.r-project.org/nosvn/R.check/r-devel-linux-x86_64-debian-clang/R.utils-00check.html
>>
>> Examples:
>>
>>> x <- "a"
>>> cat(x)
>> a>
>>> capture.output(cat(x))
>> [1] "a" "a"
>>
>>> x <- "a\n"
>>> cat(x)
>> a
>>> capture.output(cat(x))
>> [1] "a"
>>
>>> x <- "a\nb"
>>> cat(x)
>> a
>> b>
>>> capture.output(cat(x))
>> [1] "a" "b" "b"
>>
>>> x <- "a\nb\n"
>>> cat(x)
>> a
>> b
>>> capture.output(cat(x))
>> [1] "a" "b"
>>
>>> capture.output(cat(x))
>> [1] "a" "b"
>>> x <- c("a", "b")
>>> cat(x)
>> a b>
>>> capture.output(cat(x))
>> [1] "a b" "a b"
>>
>>> x <- c("a", "b\n")
>>> cat(x)
>> a b
>>> capture.output(cat(x))
>> [1] "a b"
>>
>>
>>> sessionInfo()
>> R Under development (unstable) (2015-08-12 r69024)
>> Platform: x86_64-w64-mingw32/x64 (64-bit)
>> Running under: Windows 7 x64 (build 7601) Service Pack 1
>>
>> locale:
>> [1] LC_COLLATE=English_United States.1252
>> [2] LC_CTYPE=English_United States.1252
>> [3] LC_MONETARY=English_United States.1252
>> [4] LC_NUMERIC=C
>> [5] LC_TIME=English_United States.1252
>>
>> attached base packages:
>> [1] stats     graphics  grDevices utils     datasets  methods   base
>>
>> other attached packages:
>> [1] R.utils_2.1.0-9000     R.oo_1.19.0-9000      
R.methodsS3_1.7.0-9000
>>
>> loaded via a namespace (and not attached):
>> [1] tools_3.3.0
>>
>> /Henrik
>>
>> ______________________________________________
>> R-devel at r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-devel
>
> --
> Peter Dalgaard, Professor,
> Center for Statistics, Copenhagen Business School
> Solbjerg Plads 3, 2000 Frederiksberg, Denmark
> Phone: (+45)38153501
> Office: A 4.23
> Email: pd.mes at cbs.dk  Priv: PDalgd at gmail.com
>
>
>
>
>
>
>
>
>