带有网格图形的两列投影仪/ sweave幻灯片

Question

我正在尝试使用beamer + sweave在ggplot2图形上进行演示。有些幻灯片应该有两列;左侧为代码，右侧为结果图形。这是我试过的，

\documentclass[xcolor=dvipsnames]{beamer}
\usepackage{/Library/Frameworks/R.framework/Resources/share/texmf/tex/latex/Sweave}
\usepackage[english]{babel}
\usepackage{tikz}
\usepackage{amsmath,amssymb}% AMS standards
\usepackage{listings}
\usetheme{Madrid}
\usecolortheme{dove}
\usecolortheme{rose}
\SweaveOpts{pdf=TRUE, echo=FALSE, fig=FALSE, eps=FALSE, tidy=T, width=4, height=4}

\title{Reproducible data analysis with \texttt{ggplot2} \& \texttt{R}}
\subtitle{subtitle}
\author{Baptiste Augui\'e}
\date{\today}
\institute{Here}

\begin{document}

\begin{frame}[fragile]
  \frametitle{Some text to show the space taken by the title}
\begin{columns}[t] \column{0.5\textwidth}
  Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat. Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit lobortis nisl ut aliquip ex ea commodo consequat. Duis autem vel eum iriure dolor in hendrerit in vulputate velit esse molestie consequat, vel illum dolore eu feugiat nulla facilisis at vero eros et accumsan et iusto odio dignissim qui blandit praesent luptatum zzril delenit augue duis dolore te feugait nulla facilisi. 
\column{0.5\textwidth}  
\begin{figure}[!ht]
\centering
<<fig=TRUE>>=
grid.rect(gp=gpar(fill="slateblue"))
@
\end{figure}
\end{columns}
\end{frame}

\begin{frame}[fragile]
  \frametitle{Some text to show the space taken by the title}
\begin{columns}[t] 
  \column{0.5\textwidth}
<<echo=TRUE,fig=FALSE>>=
library(ggplot2)
p <- 
qplot(mpg, wt, data=mtcars, colour=cyl) + 
  theme_grey(base_family="Helvetica")
@
\column{0.5\textwidth}  
\begin{figure}[!ht]
\centering
<<fig=TRUE>>=
print(p)
@
\end{figure}
\end{columns}
\end{frame}

\end{document}

两页输出。

我对此输出有两个问题：

• echo-ed sweave代码忽略列环境并跨越两列

• 任一图形的列边距都非常宽

有什么想法吗？

感谢。

Answer 1

• 至于第一个问题，简单的方法是在SweaveOpts中设置keep.source=TRUE。有关更精细的控制，请参阅Sweave手册的fancyvrb和FAQ＃9。
• 图的宽度可以由\setkeys{Gin}{width=1.0\textwidth}
设置

这是一个小小的修改：

... snip ...

\SweaveOpts{pdf=TRUE, echo=FALSE, fig=FALSE, eps=FALSE, tidy=T, width=4, height=4, keep.source=TRUE}

\title{Reproducible data analysis with \texttt{ggplot2} \& \texttt{R}}

... snip ...


\begin{document}
\setkeys{Gin}{width=1.1\textwidth}

... snip...

<<echo=TRUE,fig=FALSE>>=
library(ggplot2)
p <- 
  qplot(mpg,
        wt,
        data=mtcars,
        colour=cyl) +  
  theme_grey(base_family=
             "Helvetica")
@