title: Swirl "Programming E" exercise 9: could not find function "func"
body: <p>Using <code>swirl</code> "Programming E" exercise 9. </p>
  
  <p>55% progress on the exercise and trying to use the function: </p>
  
  <pre><code>evaluate &lt;- function(func, dat){
   func(dat)
  }
  </code></pre>
  
  <p>Keep getting the error message: </p>
  
  <blockquote>
    <p><code>Error in func(dat) : could not find function "func"</code></p>
  </blockquote>