upper left&#39;)</span>
<span class="sd">        &gt;&gt;&gt; plt.xlim(-5, 2.5)</span>
<span class="sd">        &gt;&gt;&gt; plt.ylim(-2.5, 2.5)</span>
<span class="sd">        &gt;&gt;&gt; plt.grid(alpha=0.4)</span>
<span class="sd">        &gt;&gt;&gt; plt.show()</span>
<span class="sd">    &quot;&quot;&quot;</span>

    <span class="n">x_min</span> <span class="o">=</span> <span class="nb">min</span><span class="p">(</span><span class="n">x_array</span><span class="p">)</span>
    <span class="n">x_max</