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copied!<p>Starting from gsk3's Seb's suggestions, here's an idea:</p> <ul> <li>the combination of username (login) and IP or name of the computer could be used to select the right directory.</li> </ul> <p>That leads to something like:</p> <pre><code> setwd (switch (paste (Sys.info () [c ("user", "nodename")], collapse="."), user.laptop = "~/Messungen", user2.server = "~/Projekte/Projekt/", )) </code></pre> <p>So there is an automatic solution, that</p> <ul> <li>works with <code>source</code></li> <li>works with <code>Sweave</code></li> <li><p>even works for interactive sessions where the commands are sent line by line</p></li> <li><p>the combination of <code>user</code> and <code>nodename</code> of course needs to be specific</p></li> <li>the paths need to be edited by hand, though.</li> </ul> <p>Improvements welcome!</p> <hr> <p>Update:</p> <p>Gabor Grothendieck answered the following to a related question on r-help today:</p> <pre><code>this.dir <- dirname(parent.frame(2)$ofile) setwd(this.dir) </code></pre> <p>which will work for <code>source</code>. </p> <hr> <p>Another update: I now do most of the data analysis work in RStudio. RStudio's projects basically solve the problem: RStudio changes the working directory to the project root directory every time I switch between projects.</p> <p>I can therefore put the project directory as far down my directory tree as I want (and the students can also put their copy wherever they want) and sync the data files and scripts/<code>.Rnw</code>s via version control (We use a private git server). The RStudio project files are kept out of the version control, i.e. <code>.gitignore</code> contains <code>.Rproj.user</code>.</p> <p>Obviously, <em>within</em> the project, the directory structure needs to be synchronized.</p>

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