numpyを使用してある条件の要素を含む列or行を削除

numpy.whereとnumpy.deleteを組み合わせて使う

>>> v = np.array(range(25)).reshape(5,5)
>>> v
array([[ 0,  1,  2,  3,  4],
       [ 5,  6,  7,  8,  9],
       [10, 11, 12, 13, 14],
       [15, 16, 17, 18, 19],
       [20, 21, 22, 23, 24]])
>>> np.delete(v, np.where(v>22)[1], 1)
array([[ 0,  1,  2],
       [ 5,  6,  7],
       [10, 11, 12],
       [15, 16, 17],
       [20, 21, 22]])
>>> np.delete(v, np.where(v>18)[0], 1)
array([[ 0,  1,  2],
       [ 5,  6,  7],
       [10, 11, 12],
       [15, 16, 17],
       [20, 21, 22]])
>>> np.delete(v, np.where(v>18)[0], 0)
array([[ 0,  1,  2,  3,  4],
       [ 5,  6,  7,  8,  9],
       [10, 11, 12, 13, 14]])
>>>