title: How to create another columns by selecting only the even rows of the original one?
body: <p>This is my dataframe:</p>
  
  <pre><code> df = data.frame(Column1 = c(0.6356695,0.8892128,1.6114966,1.8713276,1.8060065,2.2590467,1.9850608,2.8007610,1.5946618,2.7254078,0.4813844,1.8026726,0.3588233,1.3347234))
  
    Column1
  1  0.6356695
  2  0.8892128
  3  1.6114966
  4  1.8713276
  5  1.8060065
  6  2.2590467
  7  1.9850608
  8  2.8007610
  9  1.5946618
  10 2.7254078
  11 0.4813844
  12 1.8026726
  13 0.3588233
  14 1.3347234
  </code></pre>
  
  <p>I would like to create another column by extracting only the even rows from <em>Column1</em> (2, 4, 6,.., 14) and at the same time delete from <em>Column1</em> this rows.</p>
  
  <p>The final output should look like:</p>
  
  <pre><code>    Column1     Column2 
  1  0.6356695    0.8892128
  2  1.6114966    1.8713276
  3  1.8060065    2.2590467
  4  1.9850608    2.8007610
  5  1.5946618    2.7254078
  6 0.4813844    1.8026726
  7 0.3588233    1.3347234
  
  </code></pre>
  
  <p>I did this in several steps but I am sure that some of you could do this compactly and more efficiently (I tried to do it in one shot myself as well by using <code>mutate</code> but not successfull).</p>
  
  <p>Thanks a lot!</p>