Numpy学习笔记--数学函数

三角函数

a = np.array([0,30,45,60,90,120,135,150,180])

转化为弧度

b = a*np.pi/180

print(b)

[0. 0.52359878 0.78539816 1.04719755 1.57079633 2.0943951

2.35619449 2.61799388 3.14159265]

print(np.sin(b))

[0.00000000e+00 5.00000000e-01 7.07106781e-01 8.66025404e-01

1.00000000e+00 8.66025404e-01 7.07106781e-01 5.00000000e-01

1.22464680e-16]

print(np.cos(b))

[ 1.00000000e+00 8.66025404e-01 7.07106781e-01 5.00000000e-01

6.12323400e-17 -5.00000000e-01 -7.07106781e-01 -8.66025404e-01

-1.00000000e+00]

print(np.tan(b))

[ 0.00000000e+00 5.77350269e-01 1.00000000e+00 1.73205081e+00

1.63312394e+16 -1.73205081e+00 -1.00000000e+00 -5.77350269e-01

-1.22464680e-16]