title: R extract or split an interval into vectors
body: <p>What is this operation called and how do I achieve this? (I can't find an example.)</p>
  
  <p>Given</p>
  
  <pre><code>temp1
                 Var1 Freq
  1          (0,0.78]    0
  2       (0.78,0.99]    0
  3       (0.99,1.07]    0
  4      (1.07,1.201]    1
  5     (1.201,1.211]    0
  6      (1.211,1.77]    2
  </code></pre>
  
  <p>How do I split the intervals in <code>Var1</code> into two vectors for <code>start</code> and <code>end</code>?</p>
  
  <p>Like this</p>
  
  <pre><code>df2
    start   end Freq
  1 0.000 0.780    0
  2 0.780 0.990    0
  3 0.990 1.070    0
  4 1.070 1.201    1
  5 1.201 1.211    0
  6 1.211 1.770    2
  </code></pre>