title: How can I remove all duplicates so that NONE are left in a data frame?
body: <p>There is a <a href="https://stackoverflow.com/questions/3691369/how-can-i-remove-all-duplicates-from-an-array-in-php">similar question</a> for PHP, but I'm working with R and am unable to translate the solution to my problem.</p>
  
  <p>I have this data frame with 10 rows and 50 columns, where some of the rows are absolutely identical. If I use unique on it, I get one row per - let's say - "type", but what I actually want is to get only those rows which only appear once. Does anyone know how I can achieve this?</p>
  
  <p>I can have a look at clusters and heatmaps to sort it out manually, but I have bigger data frames than the one mentioned above (with up to 100 rows) where this gets a bit tricky.</p>