Why does typeof NaN return ‘number’?
Just out of curiosity. It doesn’t seem very logical that typeof NaN is number. Just like NaN === NaN or NaN == NaN … Read more
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How to replace NaNs by preceding or next values in pandas DataFrame?
Suppose I have a DataFrame with some NaNs: >>> import pandas as pd >>> df = pd.DataFrame([[1, 2, 3], [4, None, None], [None, … Read more
How to find which columns contain any NaN value in Pandas dataframe
Given a pandas dataframe containing possible NaN values scattered here and there: Question: How do I determine which columns contain NaN values? In … Read more
pandas GroupBy columns with NaN (missing) values
I have a DataFrame with many missing values in columns which I wish to groupby: import pandas as pd import numpy as np … Read more
Is it possible to set a number to NaN or infinity?
Is it possible to set an element of an array to NaN in Python? Additionally, is it possible to set a variable to … Read more
pandas DataFrame: replace nan values with average of columns
I’ve got a pandas DataFrame filled mostly with real numbers, but there is a few nan values in it as well. How can … Read more
How to select rows with one or more nulls from a pandas DataFrame without listing columns explicitly?
I have a dataframe with ~300K rows and ~40 columns. I want to find out if any rows contain null values – and … Read more
How do you test to see if a double is equal to NaN?
I have a double in Java and I want to check if it is NaN. What is the best way to do this? … Read more
Removing nan values from an array
I want to figure out how to remove nan values from my array. My array looks something like this: x = [1400, 1500, … Read more
What is the rationale for all comparisons returning false for IEEE754 NaN values?
Why do comparisons of NaN values behave differently from all other values? That is, all comparisons with the operators ==, <=, >=, <, … Read more