pecial">;</span>
    <span class="special">};</span>

<span class="special">}</span> <span class="comment">// namespaces</span>
</pre>
<h4>
<a name="math_toolkit.diff0.h1"></a>
      <span class="phrase"><a name="math_toolkit.diff0.description"></a></span><a class="link" href="diff0.html#math_toolkit.diff0.description">Description</a>
    </h4>
<p>
      The <code class="computeroutput"><span class="identifier">discrete_lanczos_derivative</span></code>
      class calculates a finite-difference approximatio