utf8 in plot labels using knitr

Question

Can't compile the following Rnw document into pdf using knitr

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage[russian]{babel}
\begin{document}

<<>>=
hist(rnorm(100),main="Гистограмма")
@

\end{document}

With labels in English everything is ok.

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Edit 1: Now i have two versions of pdf. In the first one letters are replaced by points.

In the second one all letters are overlapped. The second one is produced using addtional code chunk

<<>>=
pdf.options(encoding = "CP1251")
@

I am using Ubuntu 12.04 + R 2.14 + Texlive.

---

Edit 2:

For the moment i've found the following partial solution:

<<>>=
cairo_pdf("figure.pdf")
hist(rnorm(100),main="Гистограмма")
dev.off()
@
\includegraphics{figure.pdf}

---

Edit 3:

Using the following code:

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage[russian]{babel}
\begin{document}

<<dev='cairo_pdf'>>=
hist(rnorm(100),main="Гистограмма")
@

\end{document}

I obtain a CORRECT histogram, with a lot of WARNINGS. How to avoid or at least suppress them?

---

Finally! Ura!

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage[russian]{babel}
\begin{document}

<<dev='cairo_pdf',warning=FALSE>>=
hist(rnorm(100),main="Гистограмма")
@

\end{document}

Could i avoid warnings? Can someone explain me all that stuff with encodings and warnings?

Answer 1

You may need to set pdf.options(encoding = 'your_encoding'); see https://github.com/yihui/knitr/issues/172 I'm not entirely sure what exactly the encoding should be here.