Python numpy.isfinite()用法及代碼示例

關於：
numpy.isfinite(array [，out])：逐個元素地測試它是否有限(不是無窮大還是不是數字)，然後將結果作為布爾數組返回。
參數：

array:[array_like]Input array or object whose elements, 
        we need to test for infinity
out  :[ndarray, optional]Output array placed with result.
       Its type is preserved and it must be of the right 
       shape to hold the output.

返回：

boolean array containing the result

代碼1：

# Python Program illustrating 
# numpy.isfinite() method 
   
import numpy as geek  
  
print("Finite:", geek.isfinite(1), "\n") 
  
print("Finite:", geek.isfinite(0), "\n") 
  
# not a number 
print("Finite:", geek.isfinite(geek.nan), "\n") 
  
#  infinity 
print("Finite:", geek.isfinite(geek.inf), "\n") 
  
print("Finite:", geek.isfinite(geek.NINF), "\n")  

輸出：

Finite: True 

Finite: True 

Finite: False 

Finite: False 

Finite: False 

代碼2：

# Python Program illustrating 
# numpy.isfinite() method 
    
import numpy as geek  
   
# Returns True/False value for each element  
b = geek.arange(20).reshape(5, 4) 
                 
print("\n",b) 
print("\nIs Finite:\n", geek.isfinite(b)) 
  
  
b = [[1j],  
     [geek.inf]] 
print("\nIs Finite:\n", geek.isfinite(b))

輸出：

 [[ 0  1  2  3]
 [ 4  5  6  7]
 [ 8  9 10 11]
 [12 13 14 15]
 [16 17 18 19]]

Is Finite:
 [[ True  True  True  True]
 [ True  True  True  True]
 [ True  True  True  True]
 [ True  True  True  True]
 [ True  True  True  True]]

Is Finite:
 [[ True]
 [False]]

參考文獻：
https://docs.scipy.org/doc/numpy-dev/reference/generated/numpy.isfinite.html