Sweave in LATEX

Thanks for replying.

I'm working on a windows XP sp3 PC.

I am trying to run the test file provided by R at the moment:

################################################################

% -*- mode: noweb; noweb-default-code-mode: R-mode; -*-
\documentclass[a4paper]{article}

\title{A Test File}
\author{Friedrich Leisch}

\SweaveOpts{echo=FALSE}
\usepackage{a4wide}

\begin{document}

\maketitle

A simple example that will run in any S engine: The integers from 1 to
10 are
<<print=TRUE>>=
1:10
<<results=hide>>=
print(1:20)
@ % the above is just to ensure that 2 code chunks can follow each other

We can also emulate a simple calculator:
<<echo=TRUE,print=TRUE>>=
1 + 1
1 + pi
sin(pi/2)
@

Now we look at Gaussian data:

<<>>=
library(stats)
x <- rnorm(20)
print(x)
print(t1 <- t.test(x))
@
Note that we can easily integrate some numbers into standard text: The
third element of vector \texttt{x} is \Sexpr{x[3]}, the
$p$-value of the test is \Sexpr{format.pval(t1$p.value)}. % $

Now we look at a summary of the famous iris data set, and we want to
see the commands in the code chunks:

\SweaveOpts{echo=true}

% the following code is R-specific, as data(iris) will not run in Splus. 
% Hence, we mark it as R code. 
<<engine=R>>=
data(iris)
summary(iris)
@ %def

\begin{figure}[htbp]
  \begin{center}
<<fig=TRUE>>=
library(graphics)
pairs(iris)
@
    \caption{Pairs plot of the iris data.}
  \end{center}
\end{figure}

\begin{figure}[htbp]
  \begin{center}
<<fig=true>>=
boxplot(Sepal.Length~Species, data=iris)
@
    \caption{Boxplot of sepal length grouped by species.}
  \end{center}
\end{figure}

% R is not S-PLUS, hence this chunk will be ignored:
<<engine=S4>>=
function.that.comes.only.with.Splus(x)
@

\end{document}

##################################################

I open in Tinn-R 2.1.1.6. I save it, change the working directory in R to
the one I have the file saved in. Then execute Sweave from R with:

Sweave("C:\\R_folder\\sweave_Test\\Sweave-test-1.rnw")

Which produces the following .tex file:

##################################################

% -*- mode: noweb; noweb-default-code-mode: R-mode; -*-
\documentclass[a4paper]{article}

\title{A Test File}
\author{Friedrich Leisch}

\usepackage{a4wide}

\usepackage{Sweave}
\begin{document}

\maketitle

A simple example that will run in any S engine: The integers from 1 to
10 are
\begin{Schunk}
\begin{Soutput}
 [1]  1  2  3  4  5  6  7  8  9 10
\end{Soutput}
\end{Schunk}

We can also emulate a simple calculator:
\begin{Schunk}
\begin{Sinput}

Sweave in LATEX

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