ns <code class="code">sqrt(x *. x + y *. y)</code>, that is, the length
  of the hypotenuse of a right-angled triangle with sides of length
  <code class="code">x</code> and <code class="code">y</code>, or, equivalently, the distance of the point <code class="code">(x,y)</code>
  to origin.  If one of <code class="code">x</code> or <code class="code">y</code> is infinite, returns <code class="code">infinity</code>
  even if the other is <code class="code">nan</code>.<br>
<b>Since</b> 4.00.0<br>
</div>

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