Python math.acos()用法及代碼示例

數學模塊包含許多用於數學運算的函數。 math.acos()函數返回數字的反餘弦值。此函數中傳遞的值應在-1到1之間。

用法： math.acos(x)

以下示例說明了上述函數的用法：

範例1：

# Python code to implement 
# the acos()function 
       
# importing "math" 
# for mathematical operations   
import math   
      
a = math.pi / 6
       
# returning the value of arc cosine of pi / 6   
print ("The value of arc cosine of pi / 6 is:", end ="")   
print (math.acos(a))

輸出：

The value of arc cosine of pi / 6 is:1.0197267436954502

範例2：

# Python code implementation of  
# the acos() function 
import math  
import numpy as np  
import matplotlib.pyplot as plt   
    
in_array = np.linspace(-(1 / 3.5 * np.pi), 1 / 3.5 * np.pi, 20)  
    
out_array = []  
    
for i in range(len(in_array)):  
    out_array.append(math.acos(in_array[i]))  
    i += 1
     
print("Input_Array:\n", in_array)   
print("\nOutput_Array:\n", out_array)   
  
  
plt.plot(in_array, out_array, "go-")   
plt.title("math.acos()")   
plt.xlabel("X")   
plt.ylabel("Y")   
plt.show() 

輸出：

Input_Array: 
[-0.8975979  -0.80311391 -0.70862992 -0.61414593 -0.51966194 -0.42517795
 -0.33069396 -0.23620997 -0.14172598 -0.04724199  0.04724199  0.14172598
  0.23620997  0.33069396  0.42517795  0.51966194  0.61414593  0.70862992
  0.80311391  0.8975979 ]

Output_Array: 
[2.6850860217724004, 2.50329950258761, 2.358350863035667, 2.2320996324218134, 
2.1172515505585388, 2.009954812757658, 1.9078351422171613, 1.809259917693194,
1.7130011090538158, 1.6180559117526183, 1.5235367418371748, 1.4285915445359774,
1.3323327358965993, 1.233757511372632, 1.131637840832135, 1.0243411030312544,
0.9094930211679799, 0.783241790554126, 0.6382931510021833, 0.45650663181739287]