save data to a csv (txt) file

In [1]:

import numpy as np
import matplotlib.pyplot as plt

x = np.arange(0, 10, 0.1)
y = np.sin(x)

np.savetxt('test.txt', [x, y])

dat = np.loadtxt('test.txt')
plt.plot(dat[0], dat[1])

Out[1]:

[<matplotlib.lines.Line2D at 0x7fd38293a490>]