import numpy as np
import matplotlib.pyplot as plt
import scipy.signal

data = np.load("rate.npy")
aika = data['ts']
taajuus = data['heartrate']
aika2 = np.arange(0,4.705900599956512451e+02,0.1)

linear_interp = scipy.interpolate.interp1d(aika, taajuus, kind='linear')
linear_signal = linear_interp(aika2)

plt.figure()
plt.plot(aika2, linear_signal, '-', color='b')
plt.show()