title: boxplot from row values in a dataframe
body: <p>I got following data frame (simplified here):</p>
  
  <pre><code>    H2475  H2481  H2669  H2843  H2872  H2873  H2881  H2909
  E1 24.470 26.481 15.120 18.490 16.189 11.422 14.886 18.512
  E2  1.016  0.363  0.509  1.190  1.855  0.958  0.771  0.815
  E3  0.671  0.637  0.571  0.447  0.116  0.452  0.403  0.753
  E4  3.448  2.826  2.183  2.607  4.288  2.526  2.820  3.523
  E5  2.548  1.916  1.126  1.553  1.089  1.228  0.887  1.065
  </code></pre>
  
  <p>where E1 - E5 are row numbers. I would like to create a boxplot (or even better violin plot) for the values of each row. I want to ignore column IDs, and have row IDs as "factors". </p>
  
  <p>Something like this top answer:
  <a href="https://stackoverflow.com/questions/7147836/how-to-generate-boxplot">How to generate boxplot</a></p>
  
  <p>but with E1 - E5 as values. As you may guess I am new to melt/cast/reshape. </p>
  
  <p>Thank you very much for your help</p>