# R Language R in Latex with Knitr and Code Externalization

## Example

Knitr is an R package that allows us to intermingle R code with LaTeX code. One way to achieve this is external code chunks. External code chunks allow us to develop/test R Scripts in an R development environment and then include the results in a report. It is a powerful organizational technique. This approach is demonstrated below.

# r-noweb-file.Rnw
\documentclass{article}

<<echo=FALSE,cache=FALSE>>=
knitr::opts_chunk\$set(echo=FALSE,  cache=TRUE)
@

\begin{document}
This is an Rnw file (R noweb).  It contains a combination of LateX and R.

One we have called the read\_chunk command above we can reference sections of code in the r-file.R script.

<<Chunk1>>=
@
\end{document}


When using this approach we keep our code in a separate R file as shown below.

## r-file.R
## note the specific comment style of a single pound sign followed by four dashes

# ---- Chunk1 ----

print("This is R Code in an external file")

x <- seq(1:10)
y <- rev(seq(1:10))
plot(x,y)