[R-SIG-Mac] checking for pdflatex

[Jordan Meyer]

You may wish to try using the logical.return argument of library(). If it
returns TRUE, you could use find.package() to locate the package you are
looking for. For example:

> library(package = "BEST", logical.return = TRUE)
Loading required package: rjags
Loading required package: coda
Linked to JAGS 3.4.0
Loaded modules: basemod,bugs
[1] TRUE
> find.package(package = "BEST")
[1] "/Library/Frameworks/R.framework/Versions/3.1/Resources/library/BEST"

On Sun, Mar 15, 2015 at 6:21 PM, John Fox <jfox at mcmaster.ca> wrote:

> Dear Ian,
>
> Thanks for this. Please see below:
>
> > -----Original Message-----
> > From: Ian Gow [mailto:iandgow at gmail.com]
> > Sent: March-15-15 5:07 PM
> > To: John Fox
> > Cc: r-sig-mac at r-project.org
> > Subject: Re: [R-SIG-Mac] checking for pdflatex
> >
> > 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.
>
> Yes, I understand that, though I don't understand why there's a difference
> in the path.
>
> >
> > > 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"
>
> The problem for me is to determine whether pdflatex is installed *without*
> knowing in advance where it's installed. I haven't described the purpose of
> this, and, in the interest of brevity, won't for the time-being, but it may
> also prove necessary to determine where pdflatex resides.
>
> Best,
>  John
>
> >
> >
> > 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/
> > >
> > > _______________________________________________
> > > R-SIG-Mac mailing list
> > > R-SIG-Mac at r-project.org
> > > https://stat.ethz.ch/mailman/listinfo/r-sig-mac
>
>
> ---
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