R help - Apr 2012 - Long command in Sweave

Dear useRs,

I am writing a vignette for a package, which contains long command like
this,
>reduce(Lipset_cs,"SURVIVAL",c("GNPCAP",
"URBANIZA", "LITERACY", "INDLAB",
"GOVSTAB"),explain="positive",remainder="exclude",case="CASEID")
It is longer than the width a page and part of it will become
"missing".
Currently, I have to manually break the command into multiple lines.
Is there a better way to handle such issue?
It seems that others have raised similar question which seems to
remain unsolved in a satisfactory fashion.

Thanks for your kind attention in advance.

-- 
Wincent Ronggui HUANG
Sociology Department of Fudan University
PhD of City University of Hong Kong
http://homepage.fudan.edu.cn/rghuang/cv/

On 12-04-13 5:46 AM, Wincent wrote:
> Dear useRs,
>
> I am writing a vignette for a package, which contains long command like
this,
>> reduce(Lipset_cs,"SURVIVAL",c("GNPCAP",
"URBANIZA", "LITERACY", "INDLAB",
"GOVSTAB"),explain="positive",remainder="exclude",case="CASEID")
> It is longer than the width a page and part of it will become
"missing".
> Currently, I have to manually break the command into multiple lines.
> Is there a better way to handle such issue?
No.
> It seems that others have raised similar question which seems to
> remain unsolved in a satisfactory fashion.
You can turn on auto-formatting, but it is a worse solution, because it 
will lose all formatting from the original, including comments, white 
space, etc.  Use Sweave option keep.source=FALSE to do this.

Duncan Murdoch

On Fri, 2012-04-13 at 17:46 +0800, Wincent wrote: 
> Dear useRs,
> 
> I am writing a vignette for a package, which contains long command like
this,
> >reduce(Lipset_cs,"SURVIVAL",c("GNPCAP",
"URBANIZA", "LITERACY", "INDLAB",
"GOVSTAB"),explain="positive",remainder="exclude",case="CASEID")
> It is longer than the width a page and part of it will become
"missing".
> Currently, I have to manually break the command into multiple lines.
> Is there a better way to handle such issue?
Not that I am aware of.
> It seems that others have raised similar question which seems to
> remain unsolved in a satisfactory fashion.
> 
> Thanks for your kind attention in advance.
> 
1) use some spacing and format the code over multiple lines

reduce(Lipset_cs, "SURVIVAL",
       c("GNPCAP", "URBANIZA", "LITERACY",
"INDLAB", "GOVSTAB"),
       explain="positive", remainder="exclude",
case="CASEID")

Isn't that more readable?! Any good R-aware editor should be able to
handle appropriate formatting of the code. I *never* write long lines in
my editor; I always break the code down to fit roughly into a 72 column
editor window.

2) if you want to force Sweave to respect your new formatting, use
argument `keep.source=TRUE` for the code chunk. Or set it document wide
using \SweaveOpts{option1=value1, option2=value2} etc in the preamble
(where optionX is one of the arguments and valueX what you want to set
that argument too.

Thought IIRC, `keep.source=TRUE` is the default now and as such Sweave
will respect your formatting by default now - before it broke lines
where it could.

In short get out of the habit of writing long lines of R code; you'll be
better in the long run laying your code out logically.

HTH

G

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