Python numpy.cbrt()

这个数学函数帮助用户计算所有x为数组元素的x的立方根。
语法:

numpy.cbrt(arr, out = None, ufunc ‘cbrt’) : 

参数 :

arr : [array_like] 输入数组或对象的元素，我们需要将其平方。

返回 :

一个对所有x有立方根的数组，即数组元素

**代码 #1 : **

# Python program explaining
# cbrt () function
   
import numpy as np
   
arr1 = [1, 27000, 64, -1000]
print ("cbrt Value of arr1 : \n", np.cbrt(arr1))
   
arr2 = [1024 ,-128]
print ("\ncbrt Value of arr2 : ", np.cbrt(arr2))

输出 :

cbrt Value of arr1 : 
 [  1.  30.   4. -10.]

cbrt Value of arr2 :  [ 10.0793684  -5.0396842]

代码#2：与复数打交道

# Python program explaining
# cbrt () function
   
import numpy as np
   
a = 4 + 3j
print("cbrt(4 + 3j) : ", np.cbrt(a))
   
b = 16 + 13j
print("\ncbrt value(16 + 13j) : ", np.cbrt(b))

输出 :

TypeError: ufunc 'cbrt' not supported for the input types,
and the inputs could not be safely coerced to any supported
types according to the casting rule ''safe''

代码#3：图形化表示

# Python program explaining
# cbrt () function
   
import numpy as np
import matplotlib.pyplot as plt
   
a = np.linspace(start = -5, stop = 150,
                num = 10, endpoint = True)
                   
print("Graphical Representation : \n", np.cbrt(a))
   
plt.title("blue : with cbrt\nred : without cbrt")
plt.plot(a, np.cbrt(a))
   
plt.scatter(a, a, color = 'red')
plt.show()

输出 :

Graphical Representation : 
 [-1.70997595  2.30347441  3.08793243  3.60027433  3.99768384  4.3287262
  4.61565763  4.87076238  5.10162421  5.31329285]