# Write a NumPy program to calculate exp(x) - 1 for all elements in a given array.  
 import numpy as np
x = np.array([1., 2., 3., 4.], np.float32)
print("Original array: ")
print(x)
print("\nexp(x)-1 for all elements of the said array:")
r1 = np.expm1(x)
r2 = np.exp(x) - 1.
assert np.allclose(r1, r2)
print(r1)
