dd><p>Character string of the origin column name (when <code>m</code> is a data frame rather than a <code>matrix</code>)</p></dd>


<dt id="arg-dest">dest<a class="anchor" aria-label="anchor" href="#arg-dest"></a></dt>
<dd><p>Character string of the destination column name (when <code>m</code> is a data frame rather than a <code>matrix</code>)</p></dd>


<dt id="arg-flow">flow<a class="anchor" aria-label="anchor" href="#arg-flow"></a></dt>
<dd><p>Character string of the flow column name (when <code>m</code>