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We recommend the listings package for including R code in LaTeX documents. If you add \usepackage{listings}

to your preamble, you can then insert R code like this:

\begin{lstlisting}[language=R]
fib <- function(n) {
if (n < 2)
n
else
fib(n - 1) + fib(n - 2)
}
fib(10) # => 55
\end{lstlisting}
This help article on using Knitr may also be of interest.