R devel - Nov 2008 - "deparse" with "nlines" argument produces empty elements (PR#13299)

Full_Name: Kamil Barto?
Version: 2.8.0
OS: windows xp
Submission from: (NULL) (212.33.92.187)


According to the "deparse" function documentation "nlines"
is the *maximum*
number of lines to produce. But, when "nlines" argument is supplied,
it produces
exactly nlines of result, and the result contains empty elements at the end.

Example:
> deparse(quote(foo(1,2,3)), width.cutoff = 20, nlines=7)
[1] "foo(1, 2, 3)" ""             ""            
""             ""
""             ""           

This behavior affects e.g. output of warnings() where "..." is
attached to every
call rather than only the truncated ones.
> warnings()
Warning messages:
1: In plot.window(...) ... : "na.action" is not a graphical parameter

Although it does actually do what it is documented to do, producing the 
minimum necessary number of lines would be better, and I've altered 
R-patched to do so.

Thank you for the report.

Brian Ripley (who was in Bialowieza a couple of months ago).


On Tue, 18 Nov 2008, kbarton at zbs.bialowieza.pl wrote:
> Full_Name: Kamil Barto?
> Version: 2.8.0
> OS: windows xp
> Submission from: (NULL) (212.33.92.187)
>
>
> According to the "deparse" function documentation
"nlines" is the *maximum*
> number of lines to produce. But, when "nlines" argument is
supplied, it produces
> exactly nlines of result, and the result contains empty elements at the
end.
>
> Example:
>
>> deparse(quote(foo(1,2,3)), width.cutoff = 20, nlines=7)
> [1] "foo(1, 2, 3)" ""             ""         
""             ""
> ""             ""
>
> This behavior affects e.g. output of warnings() where "..." is
attached to every
> call rather than only the truncated ones.
>
>> warnings()
> Warning messages:
> 1: In plot.window(...) ... : "na.action" is not a graphical
parameter
>
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
>
-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595