FFT2 in Python, how does this package work? What can I apply for input? What's the output?

Question

Python

Please tell me how to correctly set the data array so that fft2 processes them correctly.

Answer 1

fft2 requires a two-dimensional array. You can create in different ways.
For example:

import numpy as np
array1 = np.arange(5*5).reshape(5, 5)
print(np.fft.fft2(array1))
t = np.sin(np.linspace(0, np.pi, 100))
array2 = np.vstack([t,t])
print(np.fft.fft2(array2))