knitrrsweave
I'm trying to insert a figure using Sweave which is located in the path C:\Users\eccehomo\Documents\mi\fig1.png. I'm using the package knitrwhich has a function called fig.pathbut I'm getting many errors for such a simple thing! Here's one of the things I have tried:
<<fig1,fig=TRUE>>=
library(knitr)
f='C:/Users/eccehomo/Documents/mi/fig1.png'
@
\includegraphics{f}
You seem to be confusing two ways of producing a pdf.
Sweave is a part of base R, and lets you include R code in an .Rnw file that will be 'sweaved' into a tex file with the results of the R code. You can then use a tex implementation to render that tex file into a PDF file.
You can also use R to produce plots and other graphic objects straight into a pdf file using the pdf() function.
To include your plot into a sweave document, replace your plot chunk with
<<name="Figure", echo=F, figure=True>>=
plot(1:10,1:10)
@
Then save your file and sweave it. sweave should produce a pdf and eps version fo your graph along with a tex document. Then run texi2dvi to produce a pdf.
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
\includegraphics{\Sexpr{f}}. LaTeX does not know the variables in R.