# Write a NumPy program to compute numerical negative value for all elements in a given array.  
 import numpy as np
x = np.array([0, 1, -1])
print("Original array: ")
print(x)
r1 = np.negative(x)
r2 = -x
assert np.array_equal(r1, r2)
print("Numerical negative value for all elements of the said array:")
print(r1)
