title: Error with setwd in R
body: <p>When trying to use the sample code for SubgraphMining (<a href="http://www.csc.ncsu.edu/faculty/samatova/practical-graph-mining-with-R/slides/pdf/Frequent_Subgraph_Mining.pdf" rel="noreferrer">the example is on 35th page</a>), I get an error:</p>
  <pre><code>&quot;Error in setwd(paste(Sys.getenv(&quot;R_HOME&quot;), &quot;library&quot;, &quot;subgraphMining&quot;,  : 
    cannot change working directory&quot;
  </code></pre>
  <p>I'm using RStudio 0.97.551, 32-bit R (2.15.3 - this version of R was recommended to use with subgraphMining), igraph0 (was recommeded too, instead of igraph library), Java installed. Operation system is Windows 8.
  Can anyone help me with the issue?</p>