title: Attempting to Check Points Inside a Circle Using Numpy
body: <p>I'm new to numpy and have been tasked with the following situation: I need to create two numpy arrays of random integers (between 0 + 1). One numpy array represents the x-coordinates and the other one represents the y-coordinates. I then need to check to see if the points fall inside a circle of radius one by using squareroot(x^2 + y^2) &lt; 1.</p>
  
  <p>I'm currently just trying to square my arrays and add them together. What is probably a very simple task is giving me no ends of trouble. </p>
  
  <pre><code>import matplotlib.pyplot as plt
  import numpy as np
  
  plots = 100
  
  dataOne = np.random.random(size = plots)
  dataTwo = np.random.random(size = plots)
  
  circle = plt.Circle((0,0), 1, alpha = 0.1)
  plt.gca().add_patch(circle)
  plt.xlim(0, 5)
  plt.ylim(0, 5)
  plt.show()
  
  squareDataOne = dataOne ** 2
  squareDataTwo = dataTwo ** 2
  
  if squareDataOne + squareDataTwo &lt; 1:
      print("Now check square-root!")
  </code></pre>
  
  <p>I keep receiving an error message: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all(). Could anyone explain why Python/Numpy does not like this? I've been told to try and use a Boolean expression to slice the array. Can anyone provide suggestions on the best way to incorporate this into my given code? 
  Any suggestions or tips for a newbie are appreciated.</p>