File vfunc_arxiv.Rnw will eventually be basically the same as the
vignette (vignettes/vfunc.Rmd) but modified for arxiv.

Weave  'vfunc_arxiv.Rnw' with something like

R CMD Sweave vfunc_arxiv.Rnw

(that takes about a minute).  This will create vfunc_arxiv.tex.

To create the pdf, you will need to latex vfunc_arxiv.tex.  For this,
you will need a couple of auxiliary files:

* arxiv.sty from https://github.com/kourgeorge/arxiv-style
* orcid.pdf, from https://orcid.org/signin
* vfunc.png, the hexsticker, copied from man/figures
* Sweave.sty, copied from the R distribution


(file inst/vfunc.bib  is a soft link from vignettes/vfunc.bib)

Then 

pdflatex vfunc_arxiv
bibtex vfunc_arxiv
pdflatex vfunc_arxiv
pdflatex vfunc_arxiv

will create vfunc_arxiv.pdf and vfunc_arxiv.bbl

These files will have to be uploaded to arxiv for it to process
vfunc_arxiv.tex; remember to upload vfunc_arxiv.bbl as well.

NOTE: the tex file, vfunc_arxiv.tex, is NOT under version control.

