Sweave and \Sexpr{}

From: Eric R. <ericr at mcs.st-and.ac.uk>
Subject: Re: [R] Sweave and \Sexpr{}
To: r-help at r-project.org
Date: Thursday, February 5, 2009, 1:03 AM
Felipe:

See Leisch's FAQ A18.  

http://www.statistik.lmu.de/~leisch/Sweave/FAQ.html#x1-20000A.18

You likely have R2HTML loaded (likely because you are using
Tinn-R) and that
causes some difficulties for Sweave that are easily solved
as described in
the FAQ.



Felipe Carrillo wrote:

Hi: 
I am trying to create a dynamic latex table using

\Sexpr{} but it's not

evaluating it. I also tried the example below without

Sweave and also

fails. I have also copied the Sweave.sty to my working

directory but

nothing seems to work. Do I need to have certain

package in order to run

\Sexpr{}?

\documentclass[a4paper]{article}
\usepackage{C:/R/R-2.8.1/share/texmf/Sweave}
\begin{document}

<<echo=false,results=hide>>=
library(lattice)
library(xtable)
data(cats, package="MASS")
@ 

\section*{The Cats Data}

Consider the \texttt{cats} regression example from

Venables \& Ripley

(1997). The data frame contains measurements of heart

and body weight

of \SExpr{nrow(cats)} cats

(\Sexpr{sum(cats$Sex=="F")} female,

\Sexpr{sum(cats$Sex=="M")} male).

A linear regression model of heart weight by sex and

gender can be

fitted in R using the command
<<>>=
lm1 = lm(Hwt~Bwt*Sex, data=cats)
lm1
@ 
Tests for significance of the coefficients are shown

in

Table~\ref{tab:coef}, a scatter plot including the

regression lines is

shown in Figure~\ref{fig:cats}.

\SweaveOpts{echo=false}

<<results=tex>>=
xtable(lm1, caption="Linear regression model for

cats data.",

label="tab:coef")
@ 

\begin{figure}
  \centering
<<fig=TRUE,width=12,height=6>>=

print(xyplot(Hwt~Bwt|Sex, data=cats,

type=c("p", "r")))

@  
  \caption{The cats data from package MASS.}
  \label{fig:cats}
\end{figure}
\begin{center}
\end{center}

\end{document}


Felipe D. Carrillo  
Supervisory Fishery Biologist  
Department of the Interior  
US Fish & Wildlife Service  
California, USA

reproducible code.

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