Get unstable period factor for a particular function.
</para>
</refsect1>
<refsect1role="parameters">
&reftitle.parameters;
<variablelist>
<varlistentry>
<term><parameter>functionId</parameter></term>
<listitem>
<para>
Function ID the factor to be read for. <linkxmlns="http://docbook.org/ns/docbook"linkend="trader.constants">TRADER_FUNC_UNST_*</link> series of constants should be used.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1role="returnvalues">
&reftitle.returnvalues;
<para>Returns the unstable period factor for the corresponding function.</para>