I think it's driven by the PATH variable, which appears to differ for me
between RStudio and R from Terminal on the one hand and R.app on the
other.
Sys.getenv("PATH")
[1] "/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin"
Sys.which("pdflatex")
pdflatex
""
If I add
Sys.setenv(PATH=paste(Sys.getenv("PATH"),"/opt/local/bin", sep=":"))
to ~/.Rprofile then R.app finds pdflatex (from MacPorts in my case).
Sys.which("pdflatex")
pdflatex
"/opt/local/bin/pdflatex"
Sys.getenv("PATH")
[1] "/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/opt/local/bin"
On 15 Mar 2015, at 16:46, John Fox wrote:
Dear list members,
I need to determine whether pdflatex is installed and have been doing
that via Sys.which("pdflatex"). This works when R is run in a terminal
window (or in RStudio):
> Sys.which("pdflatex")
pdflatex
"/usr/texbin/pdflatex"
but not from R.app:
> Sys.which("pdflatex")
pdflatex
""
The session info is the same in both cases:
-------------- snip ----------------
sessionInfo()
R version 3.1.3 (2015-03-09)
Platform: x86_64-apple-darwin13.4.0 (64-bit)
Running under: OS X 10.10.2 (Yosemite)
locale:
[1] en_CA.UTF-8/en_CA.UTF-8/en_CA.UTF-8/C/en_CA.UTF-8/en_CA.UTF-8
attached base packages:
[1] stats graphics grDevices utils datasets methods base
-------------- snip ----------------
Why is the result different? Is there a better way to check for the
presence of pdflatex?
Any help would be appreciated.
Thanks,
John
------------------------------------------------
John Fox, Professor
McMaster University
Hamilton, Ontario, Canada
http://socserv.mcmaster.ca/jfox/
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