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 <j...@mcmaster.ca> wrote: > Dear Ian, > > Thanks for this. Please see below: > > > -----Original Message----- > > From: Ian Gow [mailto:iand...@gmail.com] > > Sent: March-15-15 5:07 PM > > To: John Fox > > Cc: r-sig-mac@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@r-project.org > > > https://stat.ethz.ch/mailman/listinfo/r-sig-mac > > > --- > This email has been checked for viruses by Avast antivirus software. > > _______________________________________________ > R-SIG-Mac mailing list > R-SIG-Mac@r-project.org > https://stat.ethz.ch/mailman/listinfo/r-sig-mac > [[alternative HTML version deleted]] _______________________________________________ R-SIG-Mac mailing list R-SIG-Mac@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-mac
