The numpy.isneginf() function tests element-wise whether it is negative infinity or not, and returns the result as a boolean array.
Syntax :
numpy.isneginf(array, y = None)
Parameters :
array : [array_like]Input array or object whose elements, we need to test for infinity. y : [array_like]A boolean array with the same shape and type as x to store the result.
Return :
boolean array containing the result. For scalar input, the result is a new boolean with value True if the input is positive or negative infinity; otherwise the value is False. For array input, the result is a boolean array with the same shape as the input and the values are True where the corresponding element of the input is positive or negative infinity; elsewhere the values are False.
Code 1 :
Python
# Python Program illustrating # numpy.isneginf() method import numpy as geek
print ( "Negative : " , geek.isneginf( 1 ), "\n" )
print ( "Negative : " , geek.isneginf( 0 ), "\n" )
# not a number print ( "Negative : " , geek.isneginf(geek.nan), "\n" )
# infinity print ( "Negative : " , geek.isneginf(geek.inf), "\n" )
print ( "Negative : " , geek.isneginf(geek.NINF), "\n" )
x = geek.array([ - geek.inf, 0. , geek.inf])
y = geek.array([ 2 , 2 , 2 ])
print ( "Checking for negativity : " , geek.isneginf(x, y))
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Output :
Negative : False Negative : False Negative : False Negative : False Negative : True Checking for negativity : [1 0 0]
Code 2 :
Python
# Python Program illustrating # numpy.isneginf() method import numpy as geek
# Returns True/False value for each element b = geek.arange( 18 ).reshape( 3 , 6 )
print ( "\n" ,b)
print ( "\nIs Negative Infinity : \n" , geek.isneginf(b))
# geek.inf : Positive Infinity # geek.NINF : negative Infinity b = [[geek.inf],
[geek.NINF]]
print ( "\nIs Negative Infinity : \n" , geek.isneginf(b))
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Output :
[[ 0 1 2 3 4 5] [ 6 7 8 9 10 11] [12 13 14 15 16 17]] Is Negative Infinity : [[False False False False False False] [False False False False False False] [False False False False False False]] Is Negative Infinity : [[False] [ True]]
Note :
These codes won’t run on online IDE’s. So please, run them on your systems to explore the working.
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