Thanks, Paul.  I'm new to pandoc, so I wasn't sure which tree to bark up in 
my troubleshooting.  I'm posting a version of this question to the RStudio 
community. Hadn't thought about knitr.  Will bark up that tree, too.

On Thursday, May 7, 2020 at 7:43:20 AM UTC-7, pmags wrote:
>
> 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 <mille...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org 
> <javascript:>> 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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>>
>

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