[Rd] capture.output() duplicates last line unless newline (R-devel bug)

[Henrik Bengtsson]

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
>
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