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- <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.
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