chunk names, dots and plots

[romunov]

I've noticed that if one (accidently) uses chunk name with dots, the result plot will not behave as expected - it will not produce an image, but it will "plot". If one uses fig.cap argument, there will be figure caption. Just no plot. It would be helpful if the diagnostic output of "knitting" would indicate an invalid chunk name which may result in "unexpected behavior".

\documentclass[a4paper]{article}
\SweaveOpts{out.width = "\\maxwidth"}

\begin{document}

<<chunk.with.dot, echo = TRUE>>=
plot(1:10, 1:10, main = "chunk with dots")
@

<<chunk_no_dots, echo = TRUE>>=
plot(1:10, 1:10, main = "chunk with no dots")
@

\end{document}

[yihui]

you have been warned in the documentation: http://yihui.name/knitr/options

but you might be right -- I should replace dots with more robust characters for LaTeX

[romunov]

In my case, I was copy/pasting some variables names to chunk names for diagnosis purposes and dots slipped past me. I'm just saying it would be nice to have a warning when knitting.

[yihui]

I agree. I'll do it. Thanks!

[yihui]

Should be fixed now.

BTW, note \SweaveOpts{out.width = "\\maxwidth"} is no longer necessary; it is the default now (in the latest version).

[yihui]

The fix was problematic. I should have only fixed options$fig.path instead of options$label; the latter can confuse users when they use chunk references.

[github-actions]

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