Numpy: Drop rows with all nan or 0 values

Question

I\'d like to drop all values from a table if the rows = nan or 0.

I know there\'s a way to do this using pandas i.e pandas.dropna(how

Answer 1

In addition: if you want to drop rows if a row has a nan or 0 in any single value

a = np.array([
    [1, 0, 0],
    [1, 2, np.nan],
    [np.nan, np.nan, np.nan],
    [2, 3, 4]
])

mask = np.any(np.isnan(a) | np.equal(a, 0), axis=1)
a[~mask]

Output

array([[ 2.,  3.,  4.]])