title: List of Rows from Data Frames as Vector in R
body: <p>How can I convert rows into vectors in a list across multiple data frames?<br>
  I've been having the issue that after converting my rows into list form using:<br></p>
  
  <pre><code>pck &lt;- list(NB[1,],NY[1,],AZ[1,],TB[1,])
  </code></pre>
  
  <p>I get the error </p>
  
  <pre><code>Error in sort.int(x, na.last = na.last, decreasing = decreasing, ...) : 
    'x' must be atomic
  </code></pre>
  
  <p>when I view my list <code>pck</code> I see:</p>
  
  <pre><code>&gt; pck
  [[1]]
           V1        V2       V3      V4
  1 0.6190389 0.9105718 2.020711 1.99928
  
  [[2]]
           V1        V2       V3      V4
  1 0.6190389 0.9105718 2.020711 1.99928
  
  [[3]]
          V1       V2       V3       V4
  1 2.286501 1.395356 1.544924 1.435426
  
  [[4]]
           V1       V2       V3       V4
  1 0.9035451 1.637073 2.830873 4.209193
  </code></pre>
  
  <p>How can I convert my list to a set of atomic vectors such that I can use functions like <code>boxplot</code>? That is, how can I most simply coerce <code>pck</code> into a form like this:</p>
  
  <pre><code>&gt; pck
  [[1]]
  [1] 0.6190389 0.9105718 2.020711 1.99928
  
  [[2]]
  [1] 0.6190389 0.9105718 2.020711 1.99928
  
  [[3]]
  [1] 2.286501 1.395356 1.544924 1.435426
  
  [[4]]
  [1] 0.9035451 1.637073 2.830873 4.209193
  </code></pre>