title: python - error while using matplotlib.pyplot.scatter function for the first time
body: <p>I just wanted to get started on using the matplotlib library for the first time. </p>
  
  <p>So I type the following commands:</p>
  
  <pre><code>import numpy as np
  import scipy as sp
  import matplotlib.pyplot as plt
  data = sp.genfromtxt("web_traffic.tsv", delimiter = "\t");
  x = data[:, 0];
  y = data[:, 1];
  x = x[~sp.isnan(y)];
  y = y[~sp.isnan(y)];
  plt.scatter(x, y);
  </code></pre>
  
  <p>And I have received the following error : </p>
  
  <pre><code>&lt;matplotlib.collections.PathCollection object at 0x246abd0&gt;
  </code></pre>
  
  <p>I have no idea what is causing this, I have just installed the required packages, <code>scipy</code>, <code>matplotlib</code> and it returned to me that particular error. I tried to google it but with no results.</p>
  
  <p>I am using openSuse as OS and python came by default. My main purpose is to start learning using the <code>scykit learn</code> package. </p>
  
  <p>Can you give me any advice on how to get over this error?</p>