ox"><strong>function [X_sub, t_sub] = util_ExtractSubPeriod(X, t, subperiod, option) </strong></div>

<h2><a name="_description"></a>DESCRIPTION <a href="#_top"><img alt="^" border="0" src="../../../up.png"></a></h2>
<div class="fragment"><pre class="comment">util_ExtractSubPeriod extracts subperiod (months) from time series.
   Extracts certain months from time series, e.g. the low flow season and 
   the high flow season. See also Euser et al. (2013) who use May to
   September as low flow season and Nove