title: What to use instead of the as.real?
body: <p>I've start improving some old R code and find that next functions are <a href="http://cran.r-project.org/src/base/NEWS.html" rel="noreferrer">deprecated</a>:</p>
  
  <ul>
  <li><code>real</code> creates a double precision vector of the specified length. Each element of the vector is equal to 0.</li>
  <li><code>as.real</code> attempts to coerce its argument to be of double type.</li>
  <li><code>is.real</code> returns TRUE or FALSE depending on whether its argument is of double type or not. </li>
  </ul>
  
  <p>And what to use instead?</p>