title: python(scipy)-- setting an array element with a sequence error
body: <p>i want to create a program which calculates the average of N random numbers taken from a uniform random number distribution.The program must run for
  Ν=10,100,1000,10000,100000,1000000 random numbers.Then,i have to plot the mean value as
  a function of N.</p>
  
  <p>I did this: </p>
  
  <pre><code>from scitools.std import *
  import matplotlib.pyplot as plt
  
  
  N=10
  
  distribution=[]
  for i in range(1,7):   
      N*=10
      random_numbers=[random.uniform(0,1,size=N)]   
      distribution.append(random_numbers)
  
  
  plt.semilogx(array(range(N)),array(distribution).mean())
  plt.xlabel('N')
  plt.grid(True)
  plt.show()
  </code></pre>
  
  <p>It gives me the error in the title in the line where i do the plot.
  Also,if there is another ,more pythonic way of doing this i'll appreciate it.</p>
  
  <p>Thank you.</p>