[R] R echo code chunk runs off the page using Lyx and Sweave

[Mark Connolly]

Ista Zahn wrote:
 
> options(width=n) is supposed to work, and does for me. I don't use Lyx 
> though...
>
> -Ista
> On Tue, Nov 10, 2009 at 4:27 PM, Mark Connolly <mark_connolly at acm.org> 
> wrote:
>      
>> I am not really sure where in the interactions this is handled, but I 
>> would
>> like to keep echo-ed R code chunks from running past the right margin 
>> and
>> off the page.  I started with R and options(width=n), but this does 
>> not seem
>> to do anything (in the context of a document -- line command works just
>> fine).   I have beating my head against different Lyx document settings
>> without anything to show.  Anyone point me in the right direction?
>>
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>>           
>
>
>     

Duncan Murdoch wrote:
> Mark Connolly wrote:
>> Thanks.  I guess it kind of works for me as well.  The contents of a 
>> dataframe will display in the specified width, but doing a 
>> str(dataframe) will happily run past the width set in options and use 
>> up the device width (command line).  I guess this may be my issue.  
>> Options(width) does work for displaying the contents of an object (a 
>> dataframe, for example) in the document, but whatever device geometry 
>> exists for long lines of R output seems to be wider than my document, 
>> and long code chunks, str(dataframe) output and the like run past the 
>> edge of the document page margin when PDF is rendered.
>> So I guess the question is: Can I set device geometry somewhere so 
>> that chunks of R code wrap inside a specified width when a document 
>> is rendered?  I am using Lyx, but I think this may be between Latex 
>> and R (as orchestrated by Sweave).  Maybe the answer for Latex is the 
>> same answer for Lyx.
>>   
>
> I don't think so.  There is a strwrap() function that can do wrapping, 
> but it might not produce beautiful output.
>
> For example, if x is something where str(x) produces lines that are 
> too long, you could do
>
> cat(strwrap(capture.output(str(x)), width=20), sep="\n")
>
> to get the results displayed in width 20.
>
> Duncan Murdoch 
I think you are right.  I've looked through several PDFs in CRAN and it 
seems there are limits to control over formatting output chunks using 
standard methods.  I have seen tiny fonts, pasted SQL parts, landscape 
orientation, etc -- still with some edge run-off -- as work-arounds.  I 
reckon I'll do the same.

Mark