import numpy as np
import matplotlib.pyplot as plt
import sys

if (not len(sys.argv) == 3):
  print("Please give the data file as the first argument and the separator as the second argument to this program")
  sys.exit()

file_name = sys.argv[1]

if sys.argv[2] == "comma":
  separator = ","
elif sys.argv[2] == "space":
  separator = " "
elif sys.argv[2] == "tab":
  separator = "\t"
elif sys.argv[2] == "pipe":
  separator = "|"
else:
  print("not known separator! please choose one of {comma, space, tab, pipe}")
  exit(0);

data = np.loadtxt(file_name, delimiter = separator)

plt.figure()
plt.plot(data[:,0], data[:,1], '-bo')
if (np.shape(data)[1] == 3):
  plt.plot(data[:,0], data[:,1]/data[:,2]*100.0, '-r', linewidth=4)
  plt.legend(['Series','Analytical value'], loc = 4)
plt.grid()
plt.xlabel("i")
plt.ylabel("value")
plt.show()