title: how to format data to box-plot
body: <p>I am trying to boxplot this dataset and it is the only one of many who are very similar, which does not boxplot. I set my data <code>a &lt;- as.numeric</code>. The error message I then get is: <code>Error in x[!xna] : object of type 'builtin' is not subsettable In addition: Warning messages: 1: In is.na(x) : is.na() applied to non-(list or vector) of type 'builtin' 2: In is.na(x) : is.na() applied to non-(list or vector) of type 'builtin'</code>. </p>
  
  <p>The data looks like this when I type in </p>
  
  <pre><code>summary(a) 
  #&gt; Frontal        L45         R45        L22.5   
  #&gt; 40.0   : 2   0.0    :4   0.0    :9   na     : 4  
  #&gt; 90.0   : 2   15.0   :3   na     :3   0.0    : 2  
  #&gt; 0.0    : 1   na     :3   11.5   :1   13.2   : 1  
  #&gt; 10.0   : 1   1.7    :1   13.4   :1   14.5   : 1  
  #&gt; 10.2   : 1   15.9   :1   15.0   :1   15.0   : 1  
  #&gt; 15.0   : 1   16.5   :1   17.3   :1   15.3   : 1  
  #&gt; (Other):12   (Other):7   (Other):4   (Other):10  
  #&gt;
  #&gt; R22.5   
  #&gt; 0.0    : 4  
  #&gt; 90.0   : 2  
  #&gt; 11.7   : 1  
  #&gt; 15.0   : 1  
  #&gt; 16.0   : 1  
  #&gt; 18.9   : 1  
  #&gt; (Other):10  
  </code></pre>
  
  <p>and like this in tabulated version</p>
  
  <pre><code>Frontal
  15
  58.2
  3.8
  9.2
  23.9
  0
  na
  22.1
  46.6
  5.3
  40
  10
  32
  32.5
  90
  89.2
  72.6
  40
  10.2
  90
  
  L45
  17
  15
  8.7
  1.7
  5
  3
  na
  3.3
  16.5
  15.9
  0
  0
  na
  15
  15
  3.1
  7.4
  0
  na
  0
  
  R45
  11.5
  23.7
  0
  0
  0
  0
  na
  0
  0
  25.5
  0
  0
  0
  2.4
  15
  13.4
  17.3
  na
  5.2
  na
  
  L22.5
  19.9
  15.3
  0
  45.1
  0
  20.8
  na
  14.5
  24.4
  15
  na
  74.4
  29.3
  6.8
  8.8
  na
  13.2
  na
  40
  19.5
  
  R22.5
  40
  90
  57.1
  11.7
  2.9
  0
  0
  na
  0
  36.9
  80.2
  15
  0
  90
  30.3
  47.7
  57.6
  18.9
  16
  24.3
  </code></pre>
  
  <p>Any troubleshooting would be greatly appreciated.
  Best, 
  Leah</p>