title: How to open, load and plot a numpy file in python?
body: <p>I need to open, load and plot a numpy file in python? 
  This is my version:</p>
  
  <pre><code> import matplotlib.pyplot as plt 
  
   plt.plotfile('traces1.npy')
   plt.show()
  </code></pre>
  
  <p>This is my trace that I need to plot it:</p>
  
  <pre><code>[[-0.00824758 -0.0081808  -0.00811402 ..., -0.0077236  -0.00765425
    -0.00762086]]
  </code></pre>
  
  <p>But I had those error: </p>
  
  <pre><code>Traceback (most recent call last):
    File "traces_plot.py", line 3, in &lt;module&gt;
      plt.plotfile('trace1.npy')
    File "C:\Users\user\WinPython-64bit-2.7.6.4\python-2.7.6.amd64\lib\site-packages\matplotlib\pyplot.py", line 2311, in plotfile
      checkrows=checkrows, delimiter=delimiter, names=names)
    File "C:\Users\user\WinPython-64bit-2.7.6.4\python-2.7.6.amd64\lib\site-packages\matplotlib\mlab.py", line 2103, in csv2rec
      for row in reader:
  _csv.Error: line contains NULL byte
  </code></pre>