knitrr
I am using knitr and want to insert a line break in my fig.cap chunk option. Is this possible? The following is all I can think of but it doesn't work. I expect there's some evaluation option but I struggle to understand how evaluation works…
\documentclass{article}
\begin{document}
<<chunk1, fig.cap = "This figure is great! Do you \n agree?">>=
plot(1:10)
@
\end{document}
That is a challenging problem. As Ben Bolker pointed out, it is a one-way flow: when R is done, nothing will come back from LaTeX to R again, so R will not be able to know the value of \ref{SetSeed} in LaTeX.
However, I do not think it is completely impossible, because you actually have the *.aux file generated from LaTeX, which you can parse with R for the solution numbers, and update the raw R script from purl() with this information. One approach is that you use the same label for the R chunk as you used for the Example environment, and you will get a code chunk in the output like:
## @knitr SetSeed
# R code
Hopefully you will also see this in the *.aux file after you have run LaTeX on the *.tex file:
\newlabel{SetSeed}{{1}{1}}
Then you replace SetSeed in the R code with Solution 1.1. In all, you need some post-processing of the R script.
knitr has a few pretty straightforward ways of handling this.
knit_child() with inline R codeSay 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.RnwHey, 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:
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}
childAssuming 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}
Best Answer
Use a LaTeX linebreak instead of an R linebreak and use the caption package. The following works for me: