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<a name="Additional-gsldif-notes"></a>
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<a name="Additional-gsldif-notes-1"></a>
<h3 class="subsection">D.5.4 Additional <code>gsldif</code> notes</h3>

<p>The function <var>f</var> may be any expressible virtual machine code
function that takes a real argument to a real result, including one
that uses other library functions. However, if <var>f</var> passes
functions to other library functions as arguments, there is a constant
overhead in stack space for each level, and a remote possibility of a
<a name="index-segmentation-fault-7"></a>
segmentation fault if they are very deeply nested.
</p>
<p>Numerical instability is an issue for higher derivatives (i.e.,
differentiating a function that is obtained by differentiating another
function). Some experimentation with larger tolerances may be needed.
</p>
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