span class="o">.</span><span class="n">array</span><span class="p">([</span><span class="mf">0.4</span><span class="p">,</span> <span class="mf">0.4</span><span class="p">,</span> <span class="mf">0.4</span><span class="p">,</span> <span class="mf">0.4</span><span class="p">])</span><span class="o">*</span><span class="mf">.97</span>

    <span class="n">D</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">zeros_like</span><span class="p">(</span><span class="n"