numpy 的reshape

import numpy as np

a = np.random.randn(2, 3)
print(a)

b = a.reshape(3, 2)
print(b)

# a本身形狀不變
print(a)

# 但此時, a, b指向的內存是相同的, 但是id又不一致
a[0, 0] = 999  # a改變的時候 b也會改變
print(a)
print(b)