You are reading an old version of the documentation (v1.5.1). For the latest version see

We're updating the default styles for Matplotlib 2.0

Learn what to expect in the new updates



This Page

pylab_examples example code: spectrum_demo.pyΒΆ

(Source code, png, hires.png, pdf)

import matplotlib.pyplot as plt
import numpy as np

dt = 0.01
Fs = 1/dt
t = np.arange(0, 10, dt)
nse = np.random.randn(len(t))
r = np.exp(-t/0.05)

cnse = np.convolve(nse, r)*dt
cnse = cnse[:len(t)]
s = 0.1*np.sin(2*np.pi*t) + cnse

plt.subplot(3, 2, 1)
plt.plot(t, s)

plt.subplot(3, 2, 3)
plt.magnitude_spectrum(s, Fs=Fs)

plt.subplot(3, 2, 4)
plt.magnitude_spectrum(s, Fs=Fs, scale='dB')

plt.subplot(3, 2, 5)
plt.angle_spectrum(s, Fs=Fs)

plt.subplot(3, 2, 6)
plt.phase_spectrum(s, Fs=Fs)

Keywords: python, matplotlib, pylab, example, codex (see Search examples)