rrence-functions">Recurrence functions</a><a id="Recurrence-functions-1"></a><a class="docs-heading-anchor-permalink" href="#Recurrence-functions" title="Permalink"></a></h1><p>Given a trajectory <span>$\mathbf{x}_t \in \mathbb{R}^m$</span>, with <span>$t \in {1, 2, ..., K}$</span> and <span>$K$</span> being the length of the analyzed time series, we say that two points <span>$i$</span> and <span>$j$</span> from that trajectory are or not recurrent based on a recurrence function. Originally, the recurrence 