Python中的 numpy.maximum()

numpy.maximum()函数用于查找数组元素的元素最大值。

它比较两个数组并返回一个包含元素最大值的新数组。如果要比较的元素之一是 NaN，则返回该元素。如果两个元素都是 NaN，则返回第一个。

Syntax : numpy.maximum(arr1, arr2, /, out=None, *, where=True, casting=’same_kind’, order=’K’, dtype=None, ufunc ‘maximum’)

Parameters :
arr1 : [array_like] Input array.
arr2 : [array_like] Input array.
out : [ndarray, optional] A location into which the result is stored.
  -> If provided, it must have a shape that the inputs broadcast to.
  -> If not provided or None, a freshly-allocated array is returned.
**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.

Return : [ndarray or scalar] Result.
The maximum of arr1 and arr2, element-wise. This is a scalar if both arr1 and arr2 are scalars.

代码#1：工作

# Python program explaining
# maximum() function
  
import numpy as geek
in_num1 = 10
in_num2 = 21
  
print ("Input  number1 : ", in_num1)
print ("Input  number2 : ", in_num2) 
    
out_num = geek.maximum(in_num1, in_num2) 
print ("maximum of 10 and 21 : ", out_num) 

输出 ：

Input  number1 :  10
Input  number2 :  21
maximum of 10 and 21 :  21

代码#2：

# Python program explaining
# maximum() function
  
import numpy as geek
  
in_arr1 = [2, 8, 125]
in_arr2 = [3, 3, 15]
   
print ("Input array1 : ", in_arr1) 
print ("Input array2 : ", in_arr2)
    
out_arr = geek.maximum(in_arr1, in_arr2) 
print ("Output array after selecting maximum: ", out_arr) 

输出 ：

Input array1 :  [2, 8, 125]
Input array2 :  [3, 3, 15]
Output array after selecting maximum:  [  3   8 125]

代码#3：

# Python program explaining
# maximum() function
  
import numpy as geek
  
in_arr1 = [geek.nan, 0, geek.nan]
in_arr2 = [geek.nan, geek.nan, 0]
   
print ("Input array1 : ", in_arr1) 
print ("Input array2 : ", in_arr2)
    
out_arr = geek.maximum(in_arr1, in_arr2) 
print ("Output array after selecting maximum: ", out_arr) 

输出 ：

Input array1 :  [nan, 0, nan]
Input array2 :  [nan, nan, 0]
Output array after selecting maximum:  [ nan  nan  nan]