title: Storing a class vector in R
body: <p>I am reading a file to get an idea of the column classes. I would like to store this information in a file for later use with colClasses = classes</p>
  
  <pre><code>temp &lt;- read.delim("data.txt", header = FALSE, sep = "|", quote = "", row.names = NULL)
  
  classes &lt;- sapply(temp, class)
  </code></pre>
  
  <p>What file type does "classes" need to be stored in?</p>