Python| math.cos()函数
在Python中,数学模块包含许多数学运算,可以使用该模块轻松执行。 math.cos()
函数返回作为参数传递的值的余弦。此函数中传递的值应以弧度为单位。
Syntax: math.cos(x)
Parameter:
x : value to be passed to cos()
Returns: Returns the cosine of value passed as argument
代码#1:
# Python code to demonstrate the working of cos()
# importing "math" for mathematical operations
import math
a = math.pi / 6
# returning the value of cosine of pi / 6
print ("The value of cosine of pi / 6 is : ", end ="")
print (math.cos(a))
The value of cosine of pi/6 is : 0.8660254037844387
代码#2:
# Python program showing
# Graphical representation of
# cos() function
import math
import numpy as np
import matplotlib.pyplot as plt
in_array = np.linspace(-(2 * np.pi), 2 * np.pi, 20)
out_array = []
for i in range(len(in_array)):
out_array.append(math.cos(in_array[i]))
i += 1
print("in_array : ", in_array)
print("\nout_array : ", out_array)
# red for numpy.sin()
plt.plot(in_array, out_array, color = 'red', marker = "o")
plt.title("math.cos()")
plt.xlabel("X")
plt.ylabel("Y")
plt.show()
in_array : [-6.28318531 -5.62179738 -4.96040945 -4.29902153 -3.6376336 -2.97624567
-2.31485774 -1.65346982 -0.99208189 -0.33069396 0.33069396 0.99208189
1.65346982 2.31485774 2.97624567 3.6376336 4.29902153 4.96040945
5.62179738 6.28318531]
out_array : [1.0, 0.7891405093963934, 0.2454854871407988, -0.40169542465296987, -0.8794737512064891, -0.9863613034027223, -0.6772815716257412, -0.08257934547233249, 0.5469481581224268, 0.9458172417006346, 0.9458172417006346, 0.5469481581224268, -0.0825793454723316, -0.6772815716257405, -0.9863613034027223, -0.8794737512064893, -0.40169542465296987, 0.2454854871407988, 0.7891405093963934, 1.0]