title: Turning one row into multiple rows in r
body: <p>In R, I have data where each person has multiple session dates, and the scores on some tests, but this is all in one row. I would like to change it so I have multiple rows with the persons info, but only one of the session dates and corresponding test scores, and do this for every person. Also, each person may have completed different number of sessions.</p>
  
  <p>Ex:</p>
  
  <pre><code>ID  Name  Session1Date  Score  Score  Session2Date  Score  Score
  23  sjfd  20150904      2      3      20150908      5      7
  28  addf  20150905      3      4      20150910      6      8
  </code></pre>
  
  <p>To:</p>
  
  <pre><code>ID  Name  SessionDate  Score  Score
  23  sjfd  20150904     2      3     
  23  sjfd  20150908     5      7
  28  addf  20150905     3      4
  28  addf  20150910     6      8
  </code></pre>