% -*- 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: 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 \texttt{iris} data set, and we
want to see the commands in the code chunks:
\SweaveOpts{echo=true}
<<>>=
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}
@
\end{document}
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