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並前往https://web.physics.utah.edu/~detar/lessons/python/numpy_fft/node3.html

Plotting the result of a Fourier transform using Matplotlib's Pyplot

import numpy as np >>> import matplotlib.pyplot as plt >>> N = 256 >>> t = np.arange(N) >>> m = 4 >>> nu = float(m)/N >>> f = np.sin(2*np.pi*nu*t) >>> ft ...

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