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  <refentry id='function.is-infinite'>
   <refnamediv>
    <refname>is_infinite</refname>
    <refpurpose>Finds whether a value is infinite</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>bool</type><methodname>is_infinite</methodname>
      <methodparam><type>float</type><parameter>val</parameter></methodparam>
     </methodsynopsis>
    <para>
     Returns &true; if <parameter>val</parameter> is infinite (positive or 
     negative), like the result of <literal>log(0)</literal> or any value too 
     big to fit into a float on this platform.
    </para>
    <para>
     See also <function>is_finite</function> and
     <function>is_nan</function>.
    </para>
   </refsect1>
  </refentry>

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