rtcomment cmt"><code>Mat</code> is an immutable container for 2D homogeneous data (a &quot;matrix&quot;).</p><div class="fullcomment"><div class="comment cmt"><p><code>Mat</code> is an immutable container for 2D homogeneous data (a &quot;matrix&quot;). It is
backed by a single array. Data is stored in row-major order.</p><p>Several element access methods are provided.</p><p>The <code>at</code> method returns an instance of a <a href="scalar/Scalar.html" class="extype" name="org.saddle.scalar.Scalar">org.sad