If you're using this with RMarkdown (e.g. via RStudio) the problem most
likely lies in knitr or RMarkdown packages in terms of temporary
directories generated.

On Thu, May 7, 2020 at 10:33 AM Jason Miller <millerj870-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:

> Pandoc is used to generate a PDF from an R markdown document that has a
> chunk that generates a plot using ggplot2 and a custom function,
> progress.plot.  The chunk looks like this
>
>
> ```{r charts, echo=FALSE, fig.cap="Your progress curve"}
>
> progress.plot(student)
>
> ```
>
>
> The PDF is generated using a LaTeX engine.  I think it uses PDFlatex via
> pandoc.  This is causing a problem that appears to be close to the pandoc
> metal.
>
> It seems like pandoc uses a temporary folder to store the diagram I
> generate with ggplot2.  The name of that folder has as underscore.  This
> means the path to the graphic file, a string that's used in the .tex source
> file, has an underscore.  And the latex compiler doesn't like that.
>
>     ! Missing $ inserted.
>     <inserted text>
>                     $
>     l.142 ...de2020-05-06_files/figure-latex/charts-1}
>                                                        \caption[Your
> progress cu...
>
>
> The "_files" in the latex log snippet, above, is the name of a folder
> created by pandoc (or Rmarkdown).  I am getting a "Missing $ inserted"
> error before the latex compiler craps out.  No PDF is generated and the
> directory with the figure is deleted.
>
> Is there a pandoc configuration change to take the underscore out of the
> temporary directory's name?  Or is there any other workaround that will
> allow me to generate figures to include in my R markdown document?
>
> Thanks for whatever advice people can share.
>
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