Influences unstable period factor for functions, which are sensible to it. More information about unstable periods can be found on the <linkxlink:href="http://ta-lib.org/d_api/ta_setunstableperiod.html">TA-Lib</link> API documentation page.
</para>
</refsect1>
<refsect1role="parameters">
&reftitle.parameters;
<variablelist>
<varlistentry>
<term><parameter>functionId</parameter></term>
<listitem>
<para>
Function ID the factor should be set for. <linkxmlns="http://docbook.org/ns/docbook"linkend="trader.constants">TRADER_FUNC_UNST_*</link> constant series can be used to affect the corresponding function.