[Rd] Sweave trims console output in "tex" mode

Kirill Müller kirill.mueller at ivt.baug.ethz.ch
Fri Jan 3 13:32:09 CET 2014

On 01/03/2014 01:06 PM, Duncan Murdoch wrote:
> On 14-01-03 5:47 AM, Kirill Müller wrote:
>> I'm sorry, I didn't mean to be rude. Do you prefer including the entire
>> original message when replying? Or perhaps I misunderstood you when you
>> wrote:
> You don't need to include irrelevant material in your reply, but you 
> should include explanatory material when you are arguing about a 
> particular claim.  If you aren't sure whether it is relevant or not, 
> then you should probably ask for clarification rather than arguing 
> with the claim.
Thanks. In the future, I'll quote at least full sentences and everything 
they refer to, to avoid confusion and make sure that context is maintained.
>>   > Carriage returns usually don't matter in LaTeX, so I didn't even 
>> know
>> about this option, though I use results=tex quite often. I had to look
>> at the source to see where the newlines were going, and saw it there.
>> Could you please clarify? Thanks.
> Single carriage returns are usually equivalent to spaces. Multiple 
> carriage returns separate paragraphs, but they are rare in code chunk 
> output in my Sweave usage.  I normally put plain text in the LaTeX 
> part of the Sweave document.
Indeed, it only makes a difference for code that generates large 
portions of LaTeX (such as tikzDevice).
> I have checked my own .Rnw files, and I have used results=tex about 
> 600 times, but never used strip.white.
> I've also looked at the .Rnw files in CRAN packages, and 
> strip.white=true and strip.white=all are used there about 140 times, 
> but strip.white=false is only used 10 times.  I think only one package 
> (SweaveListingUtils) uses strip.white=false in combination with 
> results=tex.
> So while I agree Martin's "adaptive" option would have been a better 
> default than "true", I think it would be more likely to cause trouble 
> than to solve it.
I agree, given this data and considering that trimming the terminal 
newline can be considered a feature. Perhaps comments are the only use 
case where the newline is really important. But then I don't see how to 
reliably detect comments, as the catcode for % can be changed, e.g., in 
a verbatim environment. I'll consider printing a \relax after the 
comment in tikzDevice, this should be robust and sufficient.


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