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<title>GNU Scientific Library &ndash; Reference Manual: Trigamma Function</title>

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<a name="Trigamma-Function"></a>
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<p>
Next: <a href="Polygamma-Function.html#Polygamma-Function" accesskey="n" rel="next">Polygamma Function</a>, Previous: <a href="Digamma-Function.html#Digamma-Function" accesskey="p" rel="previous">Digamma Function</a>, Up: <a href="Psi-_0028Digamma_0029-Function.html#Psi-_0028Digamma_0029-Function" accesskey="u" rel="up">Psi (Digamma) Function</a> &nbsp; [<a href="Function-Index.html#Function-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Trigamma-Function-1"></a>
<h4 class="subsection">7.28.2 Trigamma Function</h4>

<dl>
<dt><a name="index-gsl_005fsf_005fpsi_005f1_005fint"></a>Function: <em>double</em> <strong>gsl_sf_psi_1_int</strong> <em>(int <var>n</var>)</em></dt>
<dt><a name="index-gsl_005fsf_005fpsi_005f1_005fint_005fe"></a>Function: <em>int</em> <strong>gsl_sf_psi_1_int_e</strong> <em>(int <var>n</var>, gsl_sf_result * <var>result</var>)</em></dt>
<dd><p>These routines compute the Trigamma function <em>\psi'(n)</em> for
positive integer <em>n</em>.
</p></dd></dl>

<dl>
<dt><a name="index-gsl_005fsf_005fpsi_005f1"></a>Function: <em>double</em> <strong>gsl_sf_psi_1</strong> <em>(double <var>x</var>)</em></dt>
<dt><a name="index-gsl_005fsf_005fpsi_005f1_005fe"></a>Function: <em>int</em> <strong>gsl_sf_psi_1_e</strong> <em>(double <var>x</var>, gsl_sf_result * <var>result</var>)</em></dt>
<dd><p>These routines compute the Trigamma function <em>\psi'(x)</em> for
general <em>x</em>.
</p></dd></dl>




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