Showing content from http://matplotlib.org/api/../mpl_examples/pylab_examples/spectrum_demo.py below:
import matplotlib.pyplot as plt import numpy as np np.random.seed(0) 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) plt.show()
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