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Python math.cos()用法及代码示例


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值。在此函数中传递的值应以弧度为单位。

用法: math.cos(x)

参数:
x:要传递给cos()的值


返回:返回作为参数传递的值的余弦值

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)) 
输出:
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() 
输出:

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]



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注:本文由纯净天空筛选整理自Shivam_k大神的英文原创作品 Python | math.cos() function。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。