📅  最后修改于: 2022-03-11 14:45:14.329000             🧑  作者: Mango
# sign method return 0 if the values in the array is 0,
# 1 is the value is greater than 0
# and -1 when the value is less than 0
import numpy as np
arr = [-10, 0, 15]
print(arr.sign) # will return [-1, 0, 1]