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numpy find rows containing nan

# in each case returns array of bool
np.isnan(a).any(axis=1) # rows where any value is nan
np.isnan(a).all(axis=1) # rows where all values are nan
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python numpy array check if all nans

np.all(np.isnan(numpy_array))
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check nan values in a np array

array_has_nan = np.isnan(array_sum)
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