title: Create Duplicate Rows and Change Values in Specific Columns
body: <p>How to create x amount of duplicates based on a row in the dataframe and change a single or multi variables from specific columns. The rows are then added to the end of the same dataframe.</p>
  
  <pre><code>  A B C D E F
  0 1 1 0 1 1 0
  1 2 2 1 1 1 0
  2 2 2 1 1 1 0
  3 2 2 1 1 1 0
  4 1 1 0 1 1 0 &lt;- Create 25 Duplicates of this row (4) and change variable C to 1
  5 1 1 0 1 1 0
  6 2 2 1 1 1 0
  7 2 2 1 1 1 0
  8 2 2 1 1 1 0 
  9 1 1 0 1 1 0 
  </code></pre>