e the blocks overlap and create anti-diagonal operators (see <a href="usingmethods.html">"Using the Methods"</a>). Operators can be horizontally or vertically concatenated using opDictionary or opStack, or simply by passing them as elements in a matrix:</p><pre class="codeinput">E = 4*opOnes(2,3);
F = [A E];
double(F)
</pre><pre class="codeoutput">
ans =

     1     1     4     4     4
     1     1     4     4     4

</pre><p>The <a href="matlab:doc('opSpot/kron')">kron</a> method computes the Kronecker pro