cdf.py

import numpy as np
import matplotlib.pyplot as plt


data = []
with open("output.txt", "r") as f:
    for line in f.readlines():
        data.append(float(line))

x = []
tmpx = set()
for i in data:
    tmpx.add(i)

for i in tmpx:
    x.append(i)

x.sort()
y = []
for i in x:
    total = 0
    for j in data:
        if i == j:
            total += 1

    y.append(float(total)/len(data))

plt.plot(x, np.cumsum(y))
plt.show()