Avoid code-chunks from breaking in Knitr? ( preferably using a chunk option ) - r

Question

Using knitr to create a pdf, codechunks break according to page breaks. Usually this is exactly what I want, but in some cases I would like to be able to avoid this. E.g. by making a code-chunk jump to the next page if it does not fit the current page. I would prefer if this could be done in a chunk option, I.E not using eg. \newpage etc.
The following is an example of a code-chunk that breaks. How do I avoid this?
\documentclass{article}
\usepackage[english]{babel}
\usepackage{lipsum}
\begin{document}
\lipsum[1-3] \textbf{The following chunk will break. How do I avoid this breaking? }
<<echo=TRUE>>=
(iris)[1:20,]
#
\end{document}

Answer 1

I left an empty environment knitrout in the knitr design for such purposes. You can redefine this environment to achieve what you want. There are many LaTeX environments that are non-breakable, such as a figure environment. Below I use the minipage environment as an example:
\documentclass{article}
\renewenvironment{knitrout}{\begin{minipage}{\columnwidth}}{\end{minipage}}
% alternatively, you can use `figure`
% \renewenvironment{knitrout}{\begin{figure}}{\end{figure}}
\begin{document}
\begin{figure}
\caption{One figure.}
\end{figure}
% placeholder
\framebox{\begin{minipage}[t][0.3\paperheight]{1\columnwidth}%
nothing
\end{minipage}}
<<echo=TRUE>>=
(iris)[1:20,]
#
\begin{figure}
\caption{Another one.}
\end{figure}
\end{document}