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  3. <title>Additional gsldif notes - avram - a virtual machine code interpreter</title>
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  26. <a name="Additional-gsldif-notes"></a>
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  28. Previous:&nbsp;<a rel="previous" accesskey="p" href="gsldif-exceptions.html#gsldif-exceptions">gsldif exceptions</a>,
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  29. Up:&nbsp;<a rel="up" accesskey="u" href="gsldif.html#gsldif">gsldif</a>
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  33. <h4 class="subsection">D.5.4 Additional <code>gsldif</code> notes</h4>
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  35. <p>The function <var>f</var> may be any expressible virtual machine code
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  36. function that takes a real argument to a real result, including one
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  37. that uses other library functions. However, if <var>f</var> passes
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  38. functions to other library functions as arguments, there is a constant
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  39. overhead in stack space for each level, and a remote possibility of a
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  40. <a name="index-segmentation-fault-721"></a>segmentation fault if they are very deeply nested.
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  42.    <p>Numerical instability is an issue for higher derivatives (i.e.,
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  43. differentiating a function that is obtained by differentiating another
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  44. function). Some experimentation with larger tolerances may be needed.
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