="n">arma_generate_sample</span>
    <span class="kn">import</span> <span class="nn">matplotlib.pyplot</span> <span class="k">as</span> <span class="nn">plt</span>

    <span class="c1"># from vtools.data.sample_series import arma</span>
    <span class="n">start</span> <span class="o">=</span> <span class="n">pd</span><span class="o">.</span><span class="n">Timestamp</span><span class="p">(</span><span class="mi">2009</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span cl