/div>

<pre><span id="VALcopysign"><span class="keyword">val</span> copysign</span> : <code class="type">float -&gt; float -&gt; float</code></pre><div class="info ">
<code class="code">copysign x y</code> returns a float whose absolute value is that of <code class="code">x</code>
  and whose sign is that of <code class="code">y</code>.  If <code class="code">x</code> is <code class="code">nan</code>, returns <code class="code">nan</code>.
  If <code class="code">y</code> is <code class="code">nan</code>, r