title: Plotting a signal in Python
body: <p>I'm trying to plot a simple signal in python, and when i run this it doesn't show any error only 'Restart' and a blank space</p>
  
  <pre><code>from pymatlab import*
  
  import numpy as np
  
  from numpy import sqrt
  
  import matplotlib.pyplot as plt
  
  import scipy as sp
  
  import math
  
  (hashtags) n, coef, freq, phase
  
  def sinyal(N,c,f,p):
  
   y=np.zeros(N)
  
   t=np.linspace(0,2*pi,N)
  
   Nf=len(c)
  
   for i in range(Nf):
  
       y+=c[i]*np.sin(f[i]*t)
  
       return y;
  
   # Signal Generator
  
   c=[2,5,10]
  
   f=[50, 150, 300]
  
   p=[0,0]
  
   N=2000
  
   x=np.linspace(0,2.0*math.pi,N)
  
   y=sinyal(N,c,f,p)
  
   plt.plot(x[:100],y[:100])
  
   plt.show()    
  </code></pre>