Python matplotlib eksen nasıl int değerlere çevrilir?

import matplotlib.pyplot as plt
import numpy as np
import math as mt
f = open("graphic/dolarvalue.txt" ,"r")
xtwo = (f.readlines())
arr_2 = np.array(xtwo)
ln = len(arr_2)
array = []
for i in range(0,ln):
  
    array.append(float(arr_2[i]))
ypoints = np.array(array)
rn = list(range(0,len(array)))
for i in rn:
    if i % 2 != 0:
        if array[-1] % 2 != 0:
            array.remove(array[-1])
        rn.remove(i)
print(rn)
plt.plot(array)
plt.show()

16.633.46
16.621.95
16.621.95
16.621.68
16.621.95
16.621.95
16.621.68
16.622.50
16.622.46
16.619.81
16.619.64
16.619.64
16.619.81
16.619.76
16.620.62
16.619.81
16.617.64
16.609.32
16.619.81
16.618.35
16.618.35