code: from matplotlib import pyplot as plt
  from mat_util import *
  
  datadir = 'from_coeus/data'
  nxs = load('nxs', datadir)
  fs = load('fs', datadir)
  
  plt.plot(fs)
  plt.xlabel("Steps")
  plt.ylabel("Objective Function Values")
  plt.title("Convergence of Objective Function")
  plt.show()
  
  input("press a key")
  
  plt.plot(nxs)
  plt.xlabel("Steps")
  plt.ylabel("1-Norm of x Values")
  plt.title("Convergence of x in 1-Norm")
  plt.show()
  
  
  
apis: matplotlib.pyplot.title matplotlib.pyplot.show matplotlib.pyplot.ylabel matplotlib.pyplot.plot matplotlib.pyplot.xlabel