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<h4 class="subsection">D.16.2 <code>rmath</code> miscellaneous functions</h4>

<p>Some less frequently used real valued mathematical functions are also
accessible by the <code>rmath</code> library interface.  The functions with
<a name="index-gamma-functions-810"></a>names in this group take a single real operand.

<pre class="example">     gammafn         lgammafn        digamma
     trigamma        tetragamma      pentagamma
</pre>
   <p class="noindent">The ones in this group take a pair of real operands
<a name="index-bessel-functions-811"></a><code>(</code><var>x</var><code>,</code><var>y</var><code>)</code>.

<pre class="example">     beta            lbeta           bessel_j       bessel_y
</pre>
   <p class="noindent">Those remaining take a triple of real operands
<code>(</code><var>x</var><code>,(</code><var>y</var><code>,</code><var>z</var><code>))</code>.

<pre class="example">     bessel_i        bessel_k
</pre>
   <p>An alternative and better documented selection of Bessel functions is
provided by the <code>bes</code> library interface (<a href="bes.html#bes">bes</a>).

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