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<title>GNU Scientific Library &ndash; Reference Manual: Arctangent Integral</title>

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<p>
Previous: <a href="Trigonometric-Integrals.html#Trigonometric-Integrals" accesskey="p" rel="previous">Trigonometric Integrals</a>, Up: <a href="Exponential-Integrals.html#Exponential-Integrals" accesskey="u" rel="up">Exponential Integrals</a> &nbsp; [<a href="Function-Index.html#Function-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Arctangent-Integral-1"></a>
<h4 class="subsection">7.17.6 Arctangent Integral</h4>
<a name="index-arctangent-integral"></a>
<dl>
<dt><a name="index-gsl_005fsf_005fatanint"></a>Function: <em>double</em> <strong>gsl_sf_atanint</strong> <em>(double <var>x</var>)</em></dt>
<dt><a name="index-gsl_005fsf_005fatanint_005fe"></a>Function: <em>int</em> <strong>gsl_sf_atanint_e</strong> <em>(double <var>x</var>, gsl_sf_result * <var>result</var>)</em></dt>
<dd><p>These routines compute the Arctangent integral, which is defined as <em>AtanInt(x) = \int_0^x dt \arctan(t)/t</em>.
</p></dd></dl>





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