title: Add duplicated rows in data frame
body: <p>I have a CSV file (2.2 mln rows, 6.5 GB in size) in which I need to multiply data rows 3/4 times, so I get around 6-10 mln rows.</p>
  
  <p>First time doing anything ever in R, so R might not be even the best tool to complete that (I just figured it might be).</p>
  
  <p>What I was able to do so far is load data into dataframe using:</p>
  
  <pre><code>df &lt;- read.table("MyFilePath", 
                header = TRUE,
                sep = ",")
  </code></pre>
  
  <p>Where do I go from here?</p>