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<h3 class="section">D.6 <code>gslevu</code></h3>

<p>This library exports a pair of functions of the form

<pre class="example">     library('gslevu','accel')
     
     library('gslevu','utrunc')
</pre>
   <p class="noindent">that take a list of real numbers <var>x</var> to a pair of real numbers
<code>(</code><var>s</var><code>,</code><var>e</var><code>)</code>.

   <p>The idea is that <var>x</var> represents the first few terms of an infinite
<a name="index-infinite-series-722"></a>series whose sum converges, but only very slowly. The functions
<a name="index-convergence-723"></a>extrapolate an estimate of the infinite summation by the Levin
<a name="index-Levin-u_002dtransform-724"></a>u-transform as documented in the GNU Scientific Library reference
manual.

   <p>For well behaved series, considerably fewer terms are needed for an
accurate estimate than a direct summation would require.

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