&gt; 0 and lambda &gt;= 0, otherwise calls <a class="link" href="../../../main_overview/error_handling.html#domain_error">domain_error</a>.
          </p>
<pre class="programlisting"><span class="identifier">RealType</span> <span class="identifier">degrees_of_freedom1</span><span class="special">()</span><span class="keyword">const</span><span class="special">;</span>
</pre>
<p>
            Returns the parameter <span class="emphasis"><em>v1</em></span> from which this object
            was constructed.
  