title: Break dataframe into smaller dataframe's and save them
body: <p>Need help to split one dataframe dynamically into multiple smaller dataframe’s based on a column interval and <strong>save</strong> them as well.
  Example: </p>
  
  <pre><code>x = data.frame(num = 1:26, let = letters, LET = LETTERS)
  </code></pre>
  
  <p>The above dataframe <strong>x</strong> needs to split into smaller dataframes based on value in <strong>num</strong>, in an interval of <strong>5</strong>.
  The result would be 6 dataframes </p>
  
  <pre><code>&gt; 1.    0 – 5
  &gt; 2.    6 – 10
  &gt; 3.    11 – 15
  &gt; 4.    16 -20
  &gt; 5.    21 -25
  &gt; 6.    26 – 30
  </code></pre>