在Python中,如果我定义一个2D数组,并将第二行设置为np.nan,那么第二行将变为全部-9223372036854775808,而不是缺少值。这里就是一个例子:
b = np.array(
[[0, 0, 0, 0, 0, 0, 0, 0, 0, 5],
[0, 3, 4, 4, 6, 6, 6, 5, 4, 5],
[0, 0, 0, 3, 6, 6, 6, 6, 6, 6],
[0, 0, 3, 4, 6, 6, 6, 6, 6, 6],
[0, 1, 2, 4, 4, 4, 4, 4, 4, 4]])
b[1, :] = np.nan
print(b)
[[