title: How to create a list or vector of data frames that can be updated individually?
body: <p>I need a way to access a group of data frames either by index (e.g., a list or a vector of data frames) so I can add vector results to one of the group of data frames using rbind() without having to explicitly specify the data frame by name. In other words, I will be computing the name or index of the data frame I will be updating in the R code. For example, I might have:</p>
  
  <pre><code>x1 &lt;- data.frame(A = c(3,4), B = c( 5, 6))
  x2 &lt;- data.frame(A = c(7, 8), B = c(9, 10))
  p &lt;- c(12, 13)
  </code></pre>
  
  <p>and I want to be able to add <code>p</code> to, say, <code>x2</code>, using <code>rbind(x2, p)</code> but I either need to have the names of the data frames in some kind of indexed variable so I can compute the data frame that will be updated, or perhaps a list of data frames. What is the best way to handle this? Help always much appreciated!</p>