title: Set plot title inside loop
body: <p>I am using a gnuplot plot loop to plot data from several plots together:</p>
  
  <pre><code>filenames = "my data files"
  plot for file in filenames file.".txt" \
  title file
  </code></pre>
  
  <p>Right now I'm using <code>title file</code> to set the plot title, but I'd like more control over the plot title without resorting to changing my file names. For example, in pseduocode, I'd like:</p>
  
  <pre><code>files = [first, second, third, fourth]
  titles = [One title, second title, third title, fourth title]
  plot for [n=1:4] files[n] titles[n]
  </code></pre>
  
  <p>Note that the titles consist of multiple words, so <code>words(titles,n)</code> is not an option. 
  Is there another method I can use to give me more flexibility in my titles?</p>