import matplotlib.pyplot as plt
import numpy as np


M = np.loadtxt('dyrebestand.txt', delimiter=' ')

mnd = M[:, 0] 
antall = M[:, 1] 

print('Antall observerte villrein jan 2007 var', 
      antall[12*2])
print('Antall observerte villrein jan 2011 var', 
      antall[12*6])

min_ant = np.argmin(antall)
min_mnd = mnd[min_ant]

aar, maaned = divmod(min_mnd, 12) 

print("Bestanden var paa sitt minste i", int(2005+aar),
      "i mnd", int(maaned))

tot_mnd = 0
for i in range(0, len(mnd), 1):
    if (antall[i] > 1000):
        tot_mnd = tot_mnd + 1
        
print('Bestanden var over 1000 dyr i', tot_mnd,'mnd')     

plt.close('all')
plt.plot(mnd,antall)
plt.xlabel('mnd')
plt.ylabel('antall')
plt.grid()

# plt.savefig('plott_dyrebestand.pdf')
plt.show()