title: qplot call overwrites list elements
body: <p>Running the R script </p>
  
  <pre><code>list1&lt;-list()
  list2&lt;-list()
  
  for(i in 1:3){
    list1[[i]]&lt;-i
  }
  
  for(i in 1:3){
    list2[[i]]&lt;-qplot(i)
  }
  </code></pre>
  
  <p>I recognize that list1 contains the elements 1,2,3. But list2 contains three times the element qplot(3). </p>
  
  <p>Is qplot not compatible with looping? How can I save my plots in a list using a loop?</p>