an><span class="w"> </span><span class="mi">1</span><span class="w"> </span><span class="o">-</span><span class="w"> </span><span class="p">(</span><span class="n">n</span><span class="o">-</span><span class="mi">1</span><span class="p">)</span><span class="o">*</span><span class="n">incx</span><span class="w"></span>
<span class="w">      </span><span class="n">elseif</span><span class="w"> </span><span class="p">(</span><span class="n">incx</span><span class="p">.</span><span class="n">ne</span><span clas