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<a name="gslint-output"></a>
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<a name="gslint-output-1"></a>
<h3 class="subsection">D.7.2 <code>gslint</code> output</h3>

<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>
<p>Results may differ in numerical properties depending on the
integration method and the tolerance used. 
</p>
<ul>
<li>
The <code>qagp</code>* and <code>qagx</code>* functions use an adaptive algorithm,
<a name="index-adaptive-integration"></a>
<a name="index-non_002dadaptive-integration"></a>
whereas the <code>qng</code>* functions use a faster non-adaptive algorithm
suitable only for smooth integrands.
</li><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><li>
Larger tolerances are conducive to faster but less accurate results in
most cases.
</li></ul>

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