[R] Problem: Sweave and math environments

[Duncan Murdoch]

On 11/4/2008 6:16 AM, Christian Reisinger wrote:
> Dear list,
> 
> I using R as the statistical package for my dissertation in political 
> sciences and I am using Sweave for documenting the work done for the 
> creation of my dataset. However, I have a problem with Sweave (which is 
> great, by the way) which is (hopefully) easy to solve:
> 
> I want Sweave to "echo" my code, so that the R source code of the code 
> chunks appears in the Latex document. However, since I am using several 
> $ signs per line, as in the example line below, Latex interprets this as 
> a math environment, despite the fact that the $ signs are within the 
> {Sinput} environment. The problem now is that I sometimes have an 
> unequal number of $ signs in an input line, so that LaTex thinks that 
> all of the following "normal" text is still part of the math 
> environment, and formats it accordingly.
> 
> This is an example input line:
> 
> Pre_Year <- MyMain3$Con_Stat[MyMain3$MyID==ID_Count[i] & 
> MyMain3$MyYear==Count_Years[y-1]]
> 
> where I have three $ sings, and LaTex thinks that everything following 
> the last $ sign is still part of a formula.

Sinput is a verbatim environment, so LaTeX should not try to interpret 
that line, if it's in an Sweave block.  Are you using the correct 
Sweave.sty file to define it?

A real reproducible example (i.e. a complete input file that fails) 
would be a lot easier to diagnose.

Duncan Murdoch

> 
> I have two question now:
> 1. Is there any way to solve the problem within Sweave itself, e.g. 
> through setting options?
> 2. If not: is there a way to generally turn off the math mode in LaTex 
> in the preamble, since I generally don't need it? (Maybe I should better 
> post this in the LaTex mailing list, but maybe some people here had 
> similar problems)
> 
> Thanks for all comments!
> Best,
> Christian
> 
> PS: I tried to replace all $ signs by \$, but this did not work either 
> and caused many LaTex errors.
>