np.fromfunction

@12/23/2022

Reference object to allow the creation of arrays which are not NumPy arrays. If an array-like passed in as supports the __array_function__ protocol, the result will be defined by it. In this case, it ensures the creation of an array object compatible with that passed in via this argument.

https://numpy.org/doc/stable/reference/generated/numpy.fromfunction.html#numpy-fromfunction

import numpy as np

# 이 코드는
np.fromfunction(lambda i,j: i + j, (7,2), dtype=int)

# 이것과 같다
[ [i + j for j in range(2)] for i in range(7)]

# 더 풀어서 쓰면 이것과 같다
a = []
for i in range(7):
    b = []
    for j in range(2):
        b.append(i+j)
    a.append(b)
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