pandoc creating folder with name that makes latex fail

[Jason Miller <millerj870-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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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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