title: Combine and run multiple R scripts from another script
body: <p>Essentially, I have constructed a sizable predictive model in R with about 10~15 separate script files for collecting, sorting, analyzing and presenting my data. Rather than just put everything into one gigantic script file, I would like to maintain some level of modularity and run each piece from a control script, or some kind of comparable control mechanism, as I've done in matlab before. Is this possible in R?</p>
  
  <p>I have read this thread as well as its related threads, but couldn't find this exact answer.
  <a href="https://stackoverflow.com/q/2284446/761313">Organizing R Source Code</a></p>