import numpy as np
print(np.empty(3))
[ -3.10503618e+231 -3.10503618e+231 -3.10503618e+231]
print(np.empty((2, 3)))
[[ -3.10503618e+231 2.68677888e+154 6.92663118e-310] [ 1.06099790e-313 6.92663119e-310 4.17211958e-309]]
print(np.empty(3).dtype)
float64
print(np.empty(3, dtype=np.int))
[-1152921504606846976 -1152921504606846976 -1152921504606846974]
print(np.empty(3, dtype=np.int).dtype)
int64
a_int = np.arange(6).reshape((2,3))
print(a_int)
[[0 1 2] [3 4 5]]
print(np.empty_like(a_int))
[[8070450532247928832 6917537789928580555 140196575903747] [ 21474836480 140196576086528 844446404968448]]
a_float = np.arange(6).reshape((2,3)) / 10
print(a_float)
[[ 0. 0.1 0.2] [ 0.3 0.4 0.5]]
print(np.empty_like(a_float))
[[ 0.00000000e+000 4.94065646e-324 9.88131292e-324] [ 1.48219694e-323 1.97626258e-323 2.47032823e-323]]
print(np.empty_like(a_float, dtype=np.int))
[[0 1 2] [3 4 5]]