Python – math.atan()函数
数学模块包含许多用于数学运算的函数。 math.atan()函数将数字的反正切作为值返回。此函数中传递的值应介于 -PI/2 和 PI/2弧度之间。
Syntax: math.atan(x)
Parameter:This method accepts only single parameters.
- x :This parameter is the value to be passed to atan()
Returns:This function returns the arctangent of a number as a value.
下面的例子说明了上述函数的使用:
示例 1:
# Python code to implement
# the atan()function
# importing "math"
# for mathematical operations
import math
a = math.pi / 6
# returning the value of arctangent of pi / 6
print ("The value of tangent of pi / 6 is : ", end ="")
print (math.atan(a))
输出:
The value of tangent of pi / 6 is : 0.48234790710102493
示例 2:
# Python code to implement
# the atan()function
import math
import numpy as np
import matplotlib.pyplot as plt
in_array = np.linspace(0, np.pi, 10)
out_array = []
for i in range(len(in_array)):
out_array.append(math.atan(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.atan()")
plt.xlabel("X")
plt.ylabel("Y")
plt.show()
输出:
Input_Array :
[0. 0.34906585 0.6981317 1.04719755 1.3962634 1.74532925
2.0943951 2.44346095 2.7925268 3.14159265]
Output_Array :
[0.0, 0.3358423725664079, 0.6094709714274295, 0.808448792630022, 0.9492822422213403, 1.0504981725497873, 1.1253388328842984, 1.1823365638628716, 1.2269249964859286, 1.2626272556789118]