#NumPy之 函数运算
import numpy as np
#math calculations
print('math calculations for array:')
a=np.array([0,1,2,3])
b=np.array([2,-1,2,3])
print(np.exp(a))
print(np.sqrt(a))
print(np.add(a,b))
# output:
# [ 1. 2.71828183 7.3890561 20.08553692]
# [ 0. 1. 1.41421356 1.73205081]
# [2 0 4 6]
c=np.linspace(0,8,20)
print('c:')
print(c)
# c:
# [ 0. 0.42105263 0.84210526 1.26315789 1.68421053 2.10526316
# 2.52631579 2.94736842 3.36842105 3.78947368 4.21052632 4.63157895
# 5.05263158 5.47368421 5.89473684 6.31578947 6.73684211 7.15789474
# 7.57894737 8. ]
print('sin(c):')
print(np.sin(c))
# sin(c):
# [ 0. 0.40872137 0.74604665 0.95305133 0.9935755 0.86054034
# 0.57718464 0.19300541 -0.2248883 -0.60349817 -0.87668803 -0.99673665
# -0.94267373 -0.72394309 -0.37875293 0.03259839 0.43825537 0.76735722
# 0.96241589 0.98935825]