title: Function to apply mean on a list of vectors without need to list the vectors (changes to a function call)
body: <p>I have multiple objects and I need to apply some function to them, in my example <code>mean</code>. But the function call shouldn't include <code>list</code>, it must look like this: <code>my_function(a, b, d)</code>.
  Advise how to do it please, probably I need <code>quote</code> or <code>substitute</code>, but I'm not sure how to use them.</p>
  <pre><code>a &lt;- c(1:15)
  b &lt;- c(1:17)
  d &lt;- c(1:19)
  my_function &lt;- function(objects) {
    lapply(objects, mean)
  }
  my_function(list(a, b, d))
  </code></pre>