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<h4 class="subsection">D.7.2 <code>gslint</code> output</h4>

<p>In all cases, if no exception occurs, the result returned is an
approximation of the integral of <var>f</var> over the interval from
<var>a</var> to <var>b</var> or from the first item of <var>p</var> to the last.

   <p>Results may differ in numerical properties depending on the
integration method and the tolerance used.

     <ul>
<li>The <code>qagp</code>* and <code>qagx</code>* functions use an adaptive algorithm,
<a name="index-adaptive-integration-729"></a><a name="index-non_002dadaptive-integration-730"></a>whereas the <code>qng</code>* functions use a faster non-adaptive algorithm
suitable only for smooth integrands. 
<li>Faster and maybe more accurate results are obtained for discontinuous
or non-differentiable integrands by the <code>qagp</code>* integration
methods if the interior points in <var>p</var> are chosen to coincide with
the discontinuities or corners. 
<li>Larger tolerances are conducive to faster but less accurate results in
most cases. 
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