re>
<h4>
<a name="math_toolkit.diff.h1"></a>
      <span class="phrase"><a name="math_toolkit.diff.description"></a></span><a class="link" href="diff.html#math_toolkit.diff.description">Description</a>
    </h4>
<p>
      The function <code class="computeroutput"><span class="identifier">finite_difference_derivative</span></code>
      calculates a finite-difference approximation to the derivative of of a function
      <span class="emphasis"><em>f</em></span> at point <span class="emphasis"><em>x</em></spa