R devel - Jan 2007 - Wishlist: Sweave: allow line breaks after forward slashes (PR#9444)

>>>>> On Thu, 11 Jan 2007 15:07:00 +0100 (CET),
>>>>> ahenningsen  (a) wrote:
  > Full_Name: Arne Henningsen
  > Version: 2.4.0
  > OS: Linux
  > Submission from: (NULL) (134.245.140.242)


  > Sweave does not allow line breaks after forward slashes ("/").
This might lead
  > to a long "substring" of a command that cannot be wrapped.
Hence, Sweave either
  > keeps this long "substring" in the current line and produces a
too long line or
  > it moves the entire "substring" in the following line and
leaves the current
  > line rather empty. This problem can be solved if Sweave is allowed to
introduce
  > line breaks after forward slashes. (I guess that this problem can also be
solved
  > if parse() adds a blank after a forward slash.)

  > Example: 
  > The following expression cannot be wrapped by Sweave:

  > mean(myDataframe$myFirstVariable)/mean(myDataframe$mySecondVariable)


In R 2.5.0 you can use Sweave option keep.source=TRUE to keep the
original formatting of source code, including all indentation and line
breaks -> does this solve your problem?

Best,
Fritz Leisch

Dear Fritz and Duncan,

thank you very much for your answers.

On Thursday 11 January 2007 15:42, friedrich.leisch at stat.uni-muenchen.de 
wrote:
> [...]
> In R 2.5.0 you can use Sweave option keep.source=TRUE to keep the
> original formatting of source code, including all indentation and line
> breaks -> does this solve your problem?
short answer: Yes.
long answer: I generally like the formatting of the code chunks by Sweave 
(deparse). Therefore, I hesitate a bit to use "keep.source=TRUE".

On Thursday 11 January 2007 15:56, murdoch at stats.uwo.ca
wrote:
> [...]
> It's actually deparse() that causes this, but the problem is already
> solved in R-devel (to become R 2.5.0).  
Great!
> If you don't like the formatting 
> that deparse() gives to one of your expressions, use the Sweave option
> keep.source=TRUE, and your original formatting will be kept for that
> chunk.  Or globally retain your formatting via
> \SweaveOpts{keep.source=TRUE} at the start of your file.
see above.

Best wishes,
Arne

-- 
Arne Henningsen
Department of Agricultural Economics
University of Kiel
Olshausenstr. 40
D-24098 Kiel (Germany)
Tel: +49-431-880 4445
Fax: +49-431-880 1397
ahenningsen at agric-econ.uni-kiel.de
http://www.uni-kiel.de/agrarpol/ahenningsen/

On 1/12/2007 2:26 AM, Arne Henningsen wrote:
> Dear Fritz and Duncan,
> 
> thank you very much for your answers.
> 
> On Thursday 11 January 2007 15:42, friedrich.leisch at stat.uni-muenchen.de
> wrote:
>> [...]
>> In R 2.5.0 you can use Sweave option keep.source=TRUE to keep the
>> original formatting of source code, including all indentation and line
>> breaks -> does this solve your problem?
> 
> short answer: Yes.
> long answer: I generally like the formatting of the code chunks by Sweave 
> (deparse). Therefore, I hesitate a bit to use "keep.source=TRUE".
> 
> On Thursday 11 January 2007 15:56, murdoch at stats.uwo.ca wrote:
>> [...]
>> It's actually deparse() that causes this, but the problem is
already
>> solved in R-devel (to become R 2.5.0).  
> 
> Great!
I think you misunderstood me, given the "long answer".  We haven't
changed the way deparse() handles "/". The solution in R-devel is
given
below.

Duncan Murdoch
>> If you don't like the formatting 
>> that deparse() gives to one of your expressions, use the Sweave option
>> keep.source=TRUE, and your original formatting will be kept for that
>> chunk.  Or globally retain your formatting via
>> \SweaveOpts{keep.source=TRUE} at the start of your file.
> 
> see above.
> 
> Best wishes,
> Arne
>