title: Understanding with julia dataframes indexing
body: <p>I am learning julia and i've just found this line:</p>
  <pre><code>if(any(mach_df[start_slot:(start_slot + task_setup_time), Symbol(machine)].== 0))
  </code></pre>
  <p>What does it mean?, I know any is a function that returns true if every value of the parameter is true but I just can't understand what is inside the brakets.</p>
  <p>Regards</p>