[Tex/LaTex] Input Tex file in knitr file

knitr

I am showing a simple example here just to frame the question.

\documentclass{article}

\begin{document}

<<>>=
library('ggplot2')
dataset <- diamonds
@

\begin{table}[htbp]
  \centering
  \begin{tabular}{c|c|c|c}
  \textbf{Name} & \textbf{Columns} \\\hline \hline
  dataset & \Sexpr{length(colnames(dataset))} \\
  \end{tabular}
  \caption{Repeated table}
\end{table}

\end{document}

Now I am repeating this table (exact table) multiple times over the file. (Imagine replacing dataset with another set before calling this table).

\documentclass{article}

\begin{document}

<<>>=
library('ggplot2')
dataset <- diamonds;
@

\input{table-file.tex}

\end{document}

I am putting the entire tabular part into this file, and then input it several places. But I can't get this to work. I was wondering if this is possible? any better approaches to make this table "modular".

Thanks

Best Answer

Here is an example using the knitr child file process as per the knitr documentation yihui.name/knitr/demo/child.

First the new main file which I called 'knitr01.Rnw'

\documentclass{article}

\begin{document}

<<>>=
library('ggplot2')
dataset <- diamonds
@

<<child='child-knitr01.Rnw'>>=
@

<<>>=
dataset<-mtcars
@

<<child='child-knitr01.Rnw'>>=
@
\end{document}

Note that I inputed the child twice each with a different dataset.

And the child file which I named 'child-knitr01.Rnw'.

\begin{table}[htbp]
  \centering
  \begin{tabular}{c|c|c|c}
  \textbf{Name} & \textbf{Columns} \\\hline \hline
  dataset & \Sexpr{length(colnames(dataset))} \\
  \end{tabular}
  \caption{Repeated table}
\end{table}

When run first through 'knit' and then through 'pdflatex' it results in

enter image description here

To continue the demonstration for completeness, this also allows child files to input grandchildren.

The knitr01.Rnw is changed as follows.

\documentclass{article}
\begin{document}
<<>>=
library('ggplot2')
dataset <- diamonds
title="These are diamonds"
@

<<child='child-knitr01.Rnw'>>=
@

<<>>=
dataset<-mtcars
title="These are cars"
@

<<child='child-knitr01.Rnw'>>=
@

\end{document}

Here is the revised 'child-knitr01.Rnw' file

\begin{table}[htbp]
  \centering
  \begin{tabular}{c|c|c|c}
  \textbf{Name} & \textbf{Columns} \\\hline \hline
  dataset & \Sexpr{length(colnames(dataset))} \\
  \end{tabular}
  \caption{\Sexpr{paste(substr(capture.output(print(title)),5,50))}}
  % The 5 is to remove some leading R stuff (try with 1 to see why)
  % The 50 is chosen to be longer than the string
\end{table}

<<child='grand-child-knitr01.Rnw'>>=
@

And here is the 'grand-child-knitr01.Rnw' file

Demonstration that you can call on 'grandchildren' files with knitr.

<<>>=
names(dataset)  
@

And the output is: enter image description here

Option 1: Using `knit_child()` with inline R code

Say your setup is like the following. In the same directory, you have:

`graph.R`

## ---- graph
library(ggplot2)
CarPlot <- ggplot() +
    stat_summary(data= mtcars,
                 aes(x = factor(gear),
                     y = mpg
                 ),
                 fun.y = "mean",
                 geom = "bar"
                 )
CarPlot

`chapter1.Rnw`

Hey, look, a graph (Figure~\ref{fig:graph})!

<<graph, echo=FALSE, message=FALSE, fig.lp='fig:', out.width='.5\\linewidth', fig.align='center', fig.cap="A graph", fig.pos='h!'>>=
@

`main.Rnw`

\documentclass{article}

\begin{document}

<<external-code, echo=FALSE, cache=FALSE>>=
read_chunk('./graph.R')
@

\Sexpr{knit_child('chapter1.Rnw')}

\end{document}

Then, you can knit the main.Rnw file and compile the resulting .tex file with either pdflatex or xelatex.

The output is:

enter image description here

Note that you can also read the external .R file from the child .Rnw file.

So, the following would have worked just as well.

`chapter1-mod.Rnw`

<<external-code, echo=FALSE, cache=FALSE>>=
read_chunk('./graph.R')
@

Hey, look, a graph (Figure~\ref{fig:graph})!

<<graph, echo=FALSE, message=FALSE, fig.lp='fig:', out.width='.5\\linewidth', fig.align='center', fig.cap="A graph", fig.pos='h!'>>=
@

`main-mod.Rnw`

\documentclass{article}

\begin{document}

\Sexpr{knit_child('chapter1-mod.Rnw')}

\end{document}

Option 2: Using chunk option `child`

Assuming you have graph.R and chapter1.Rnw from above in the same directory, then your main.Rnw should be:

\documentclass{article}

\begin{document}

<<external-code, echo=FALSE, cache=FALSE>>=
read_chunk('./graph.R')
@

<<child-demo, child='chapter1.Rnw'>>=
@

\end{document}

Note that you can also read the external .R file from within the child document in this case, too.

So, assuming you had graph.R and chapter1-mod.Rnw from above in the same directory, then your main-mod.Rnw file should be:

\documentclass{article}

\begin{document}

<<child-demo, child='chapter1-mod.Rnw'>>=
@

\end{document}

[Tex/LaTex] Embedding knitr tex files on a bigger latex file

The easiest way to do it, would be to make your main document also a .Rnw file, that could contain nothing but LaTeX (at first).

Within the main .Rnw document you could do something like

<<child="myTable.Rnw">>=
@

where myTable.Rnw can be any .Rnw file that does not include header information, e.g. your example document without documentclass and begin{document}/\end{document}

Of course you could just as well include the r-chunk from myTable.Rnw in to the main document (as well as other r-chunks).

Best Answer

Related Solutions

[Tex/LaTex] Building TeX file from knitr Rnw as child of larger parent TeX file to use R objects and output

Option 1: Using knit_child() with inline R code

graph.R

chapter1.Rnw

main.Rnw

chapter1-mod.Rnw

main-mod.Rnw

Option 2: Using chunk option child