

<span class="keyword">if</span> ~exist(<span class="string">'n'</span>,<span class="string">'var'</span>), n=12; <span class="keyword">end</span>                 <span class="comment">% n = dimension of x (#cols of A)</span>
<span class="keyword">if</span> ~exist(<span class="string">'m'</span>,<span class="string">'var'</span>), m=10*n; <span class="keyword">end</span>               <span class="comment">% m = dimension of y (#rows of A)</span>
<span class="keyword">if</span> ~exist(<span class="string">