code: #!/usr/bin/env python3
  import matplotlib.pyplot as plt
  import numpy as np
  plt.title('Un primo plot con Python')
  plt.xlabel('x')
  plt.ylabel('y')
  x = np.linspace(0.0, 5.0, 100)
  y = x
  plt.plot(x,y,label='y=x')
  x, y = np.loadtxt('temp.dat', usecols=(0,2), delimiter=' ', unpack=True)
  plt.plot(x,y, 'x',label='Loaded from file!')
  plt.savefig('traiettoria.png')
  plt.show()
  
apis: matplotlib.pyplot.savefig matplotlib.pyplot.title matplotlib.pyplot.show matplotlib.pyplot.ylabel matplotlib.pyplot.plot numpy.linspace matplotlib.pyplot.xlabel numpy.loadtxt