">arr</a></span></code></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-concatenate"><a href="#val-concatenate" class="anchor"></a><code><span><span class="keyword">val</span> concatenate : <span><span class="optlabel">?axis</span>:int <span class="arrow">&#45;&gt;</span></span> <span><span><a href="#type-arr">arr</a> array</span> <span class="arrow">&#45;&gt;</span></span> <a href="#type-arr">arr</a></span></code></div></div><div class="odoc-spec"><div class="spec value anchored"