Python numpy.floor_divide()用法及代码示例

numpy.floor_divide(arr1，arr2，/，out =没有，其中=真正，cast ='same_kind‘，order =‘ķ‘，dtype = None)：

将第一个数组中的数组元素除以第二个数组中的元素(所有操作均按元素进行)。 arr1和arr2必须具有相同的形状。
它等效于Python //运算符，并与Python％(余数)函数配对，因此b = a％b + b *(a //b)直至四舍五入。

参数：

arr1     : [array_like]Input array or object which works as numerator.

arr2     : [array_like]Input array or object which works as denominator. 

out      : [ndarray, None, optional]Output array with same dimensions as
           Input array, placed with result.

**kwargs : Allows you to pass keyword variable length of argument to a function. 
            It is used when we want to handle named argument in a function.

where    : [array_like, optional]True value means to calculate the universal 
            functions(ufunc) at that position, False value means to leave the 
            value in the output alone.

返回：

An array with floor(x1 / x2)

代码1：arr1除以arr2

# Python program explaining 
# floor_divide() function 
import numpy as np 
  
# input_array 
arr1 = [2, 2, 2, 2, 2] 
arr2 = [2, 3, 4, 5, 6] 
print ("arr1         : ", arr1) 
print ("arr1         : ", arr2) 
  
# output_array 
out = np.floor_divide(arr1, arr2) 
print ("\nOutput array : ", out)

输出：

arr1         :  [2, 2, 2, 2, 2]
arr1         :  [2, 3, 4, 5, 6]

Output array :  [1 0 0 0 0]

代码2：arr1的元素除以除数

# Python program explaining 
# floor_divide() function 
import numpy as np 
  
# input_array 
arr1 = [2, 7, 3, 11, 4] 
divisor = 3
print ("arr1         : ", arr1) 
  
# output_array 
out = np.floor_divide(arr1, divisor) 
print ("\nOutput array : ", out)

输出：

arr1         :  [2, 7, 3, 11, 4]

Output array :  [0 2 1 3 1]

代码3：如果arr2具有-ve元素，则floor_divide处理结果

# Python program explaining 
# floor_divide() function 
import numpy as np 
  
# input_array 
arr1 = [2, 6, 21, 21, 12] 
arr2 = [2, 3, 4, -3, 6] 
print ("arr1         : ", arr1) 
print ("arr2         : ", arr2) 
  
# output_array 
out = np.floor_divide(arr1, arr2) 
print ("\nOutput array : ", out)

输出：

arr1         :  [2, 6, 21, 21, 12]
arr2         :  [2, 3, 4, -3, 6]

Output array :  [ 1  2  5 -7  2]

参考文献：
https://docs.scipy.org/doc/numpy-1.13.0/reference/generated/numpy.floor_divide.html
。