title: Add a value to all elements in a list (R)
body: <p>I have a list like so:</p>
  
  <pre><code>a = list('bla'=c(0,1,2,3))
  </code></pre>
  
  <p>I want to add 1 to every element so </p>
  
  <pre><code>&gt; a['bla']
  $bla
  [1] 1 2 3 4
  </code></pre>
  
  <p>Of course</p>
  
  <pre><code>&gt; a['bla']+1
  </code></pre>
  
  <p>doesn't work...</p>
  
  <p>Help?</p>