Top "Nan" questions

Convert pandas.Series from dtype object to float, and errors to nans

Consider the following situation: In [2]: a = pd.Series([1,2,3,4,'.']) In [3]: a Out[3]: 0 1 1 2 2 3 3 4 4 . dtype: object In [8]: a.astype('float64', …

python pandas nan

Replace None with NaN in pandas dataframe

I have table x: website 0 http://www.google.com/ 1 http://www.yahoo.com 2 None I want to replace python None …

pandas dataframe replace nan nonetype

Display rows with one or more NaN values in pandas dataframe

I have a dataframe in which some rows contain missing values. In [31]: df.head() Out[31]: alpha1 alpha2 gamma1 gamma2 chi2…

python pandas dataframe nan

Numpy - Replace a number with NaN

I am looking to replace a number with NaN in numpy and am looking for a function like numpy.nan_…

python arrays numpy nan gdal

How to filter in NaN (pandas)?

I have a pandas dataframe (df), and I want to do something like: newdf = df[(df.var1 == 'a') & (df.…

python pandas nan

Elegant way to create empty pandas DataFrame with NaN of type float

I want to create a Pandas DataFrame filled with NaNs. During my research I found an answer: import pandas as …

python pandas numpy dataframe nan

How to replace NaNs by preceding values in pandas DataFrame?

Suppose I have a DataFrame with some NaNs: >>> import pandas as pd >>> df = pd.…

python python-3.x pandas dataframe nan

Counting the number of non-NaN elements in a numpy ndarray in Python

I need to calculate the number of non-NaN elements in a numpy ndarray matrix. How would one efficiently do this …

python numpy matrix nan

C/C++ NaN constant (literal)?

Is this possible to assign a NaN to a double or float in C/C++? Like in JavaScript you do: …

c++ nan

Linear model function lm() error: NA/NaN/Inf in foreign function call (arg 1)

Say I have data.frame a I use m.fit <- lm(col2 ~ col3 * col4, na.action = na.exclude) …

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