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knitr
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<<setup, include=FALSE, cache=FALSE>>=
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library(knitr)
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opts_chunk$set(fig.path='figure/twocolumn-', fig.align='center', fig.show='hold')
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render_listings()
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@
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\begin_layout Title
Using knitr in A Two-column Document
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\begin_layout Author
Yihui Xie
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\begin_layout Standard
We can use the 
\family typewriter
figure*
\family default
 environment in LaTeX so that figures can span over two columns.
 Because the output hooks use the 
\series bold
framed
\series default
 package which does not work well with the 
\family typewriter
figure*
\family default
 environment, we can either modify the output hooks or use other packages
 like 
\series bold
listings
\series default
.
 For example,
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<<chunk-hook, echo=2, tidy=TRUE, tidy.opts=list(width.cutoff=30)>>=
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<<setup>>
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@
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<<boring-plots, fig.width=5, fig.height=5, out.width='.45
\backslash

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linewidth'>>=
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x=rnorm(100)
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boxplot(x)
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hist(x,main='')
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@
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\begin_inset Caption

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Two plots spanning over two columns.
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The output PDF file will be like: 
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https://github.com/yihui/knitr/releases/download/doc/knitr-twocolumn.pdf
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.
 The Rnw source of this document is at 
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https://github.com/yihui/knitr/blob/master/inst/examples/knitr-twocolumn.Rnw
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.
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