  <span class="n">jcol</span><span class="p">(</span> <span class="n">nz</span> <span class="o">+</span><span class="mi">1</span><span class="p">:</span><span class="n">ntot</span><span class="p">)</span> <span class="o">=</span> <span class="o">-</span><span class="mi">1</span>
      <span class="n">irow</span><span class="p">(</span> <span class="n">nz</span> <span class="o">+</span><span class="mi">1</span><span class="p">:</span><span class="n">ntot</span><span class="p">)</span> <span class="o">=</span