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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 ...

May 31, 2022
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Programming, Python

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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],...

May 28, 2022
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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 ...

May 25, 2022
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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 ...

May 25, 2022
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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 ...

May 20, 2022
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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 ...

May 16, 2022
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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? ...

May 16, 2022
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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 =...

May 15, 2022
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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 ==, <=, >=, <, ...

May 14, 2022
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