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<title>Arctangent Integral - GNU Scientific Library -- Reference Manual</title>
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<h4 class="subsection">7.17.6 Arctangent Integral</h4>
<p><a name="index-arctangent-integral-533"></a>
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— Function: double <b>gsl_sf_atanint</b> (<var>double x</var>)<var><a name="index-gsl_005fsf_005fatanint-534"></a></var><br>
— Function: int <b>gsl_sf_atanint_e</b> (<var>double x, gsl_sf_result * result</var>)<var><a name="index-gsl_005fsf_005fatanint_005fe-535"></a></var><br>
<blockquote><p>These routines compute the Arctangent integral, which is defined as AtanInt(x) = \int_0^x dt \arctan(t)/t.
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