title: Got an extra line on python plot
body: <p>i'm using pyplot to show the FFT of the signal 'a', here the code:</p>
  
  <pre><code>myFFT = numpy.fft.fft(a)
  x = numpy.arange(len(a))
  fig2 = plt.figure(2)
  plt.plot(numpy.fft.fftfreq(x.shape[-1]), myFFT)
  fig2.show()
  </code></pre>
  
  <p>and i get this figure
  <a href="https://i.stack.imgur.com/21CFm.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/21CFm.png" alt="enter image description here"></a></p>
  
  <p>There is a line from the begin to the end of the signal in the frequency domain. How i can remove this line? AM I doing something wrong with pyplot?</p>