I am trying to find a mean of spesific column in a dataframe but I take -inf as a result what is that mean ?
df [df["col_name1"] == 0]["col_name1"].mean()
result : -inf
What does " -inf " mean in python?
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1 Answers
It's "negative infinity", which is the result of IEEE 754 directed roundings
- https://en.wikipedia.org/wiki/IEEE_754#Directed_roundings
- https://numpy.org/devdocs/reference/constants.html
in stock Python
>>> -math.inf
-inf
and in Pandas/NumPy
>>> import numpy as np
>>> np.Inf
inf
Example of directed rounding
>>> a = 1 * math.inf
>>> a + 100
inf
>>> -a + 100
-inf
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