title: Determining different rows between two data sets in R
body: <p>I have two data files in tab separated CSV format. The files are in the following format:</p>
  
  <pre><code>EP Code    EP Name    Address    Region    ...
  101654    Alpha     York Street    Northwest    ...
  103628    Beta    5th Avenue    South    ...
  </code></pre>
  
  <p>EP codes are unique. What I want to do is to compare two files with respect to EP codes, determine the different rows and write them into a new file.</p>
  
  <p>For example, file1.csv has 800 rows and file2.csv has 850 rows. file2 could be a file completely including file1 plus 50 rows; or it could be <code>file1 - 10 rows + 60 rows</code>. I want to determine the differences between two data sets. I'm not interested in the mutual rows.</p>
  
  <p>How can I do that in R?</p>