span class="p">)</span>

  <span class="k">allocate</span><span class="p">(</span><span class="n">dfdt</span><span class="p">(</span><span class="n">mdm</span><span class="p">,</span><span class="mi">2</span><span class="p">:</span><span class="n">idm</span><span class="o">-</span><span class="mi">1</span><span class="p">,</span><span class="mi">2</span><span class="p">:</span><span class="n">jdm</span><span class="o">-</span><span class="mi">1</span><span class="p">))</span>
  <span class="n">dfdt</span> <