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numpy.isfinite() in Python

  • Last Updated : 23 Oct, 2020

The numpy.isfinite() function tests element-wise whether it is finite or not(not infinity or not Not a Number) and return the result as a boolean array.
Syntax :

numpy.isfinite(array [, out])

Parameters :

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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.

Return :



boolean array containing the result

Code 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")  

Output :

Finite :  True 

Finite :  True 

Finite :  False 

Finite :  False 

Finite :  False 

Code 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))

Output :

 [[ 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]]

References :
https://docs.scipy.org/doc/numpy-dev/reference/generated/numpy.isfinite.html

Note :
These codes won’t run on online-ID. Please run them on your systems to explore the working.
.
This article is contributed by Mohit Gupta_OMG πŸ˜€. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

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