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  27. <a name="gslevu-calling-conventions"></a>
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  29. Next:&nbsp;<a rel="next" accesskey="n" href="gslevu-exceptions.html#gslevu-exceptions">gslevu exceptions</a>,
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  30. Previous:&nbsp;<a rel="previous" accesskey="p" href="gslevu.html#gslevu">gslevu</a>,
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  31. Up:&nbsp;<a rel="up" accesskey="u" href="gslevu.html#gslevu">gslevu</a>
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  35. <h4 class="subsection">D.6.1 <code>gslevu</code> calling conventions</h4>
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  37. <p>The input to either of these functions is a list of real numbers
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  38. represented as explained in <a href="math.html#math">math</a>.
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  40.    <p>The result is a pair <code>(</code><var>s</var><code>,</code><var>e</var><code>)</code> holding an estimate of
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  41. the sum, <var>s</var>, and an estimate of the error in the sum,
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  42. <var>e</var>, each being a real number.
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  43. 

  44.    <p>Both functions compute the same sum, <var>s</var>, but the <code>utrunc</code> function
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  45. is faster and
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  46. <a name="index-infinite-sum-725"></a>more memory efficient, using a less trustworthy method of estimating
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  47. the error.
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