title: Mass rbind.fill for many data frames
body: <p>I am attempting to row bind many data frames together into a single massive data frame.  The data frames are named sequentially with the first named <code>df1</code>, the second named <code>df2</code>, the third named <code>df3</code>, etc. Currently, I have bound these data frames together by explicitly typing the names of the data frames; however, for a very large number of data frames (roughly 10,000 total data frames are expected) this is suboptimal.</p>
  
  <p>Here is a working example:</p>
  
  <pre><code># Load required packages
  library(plyr)
  
  # Generate 100 example data frames
  for(i in 1:100){
     assign(paste0('df', i), data.frame(x = rep(1:100),
                                        y = seq(from = 1,
                                                to = 1000,
                                                length = 100)))
    }
  }
  
  # Create a master merged data frame
   df &lt;- rbind.fill(df1, df2, df3, df4, df5, df6, df7, df8, df9, df10,
               df11, df12, df13, df14, df15, df16, df17, df18, df19, df20,
               df21, df22, df23, df24, df25, df26, df27, df28, df29, df30,
               df31, df32, df33, df34, df35, df36, df37, df38, df39, df40,
               df41, df42, df43, df44, df45, df46, df47, df48, df49, df50,
               df51, df52, df53, df54, df55, df56, df57, df58, df59, df60,
               df61, df62, df63, df64, df65, df66, df67, df68, df69, df70,
               df71, df72, df73, df74, df75, df76, df77, df78, df79, df80,
               df81, df82, df83, df84, df85, df86, df87, df88, df89, df90,
               df91, df92, df93, df94, df95, df96, df97, df98, df99, df100)
  </code></pre>
  
  <p>Any thoughts on how to optimize this would be greatly appreciated.</p>