假设我有以下两个数组:
a = array([(1, 'L', 74.423088306605), (5, 'H', 128.05441039929008),
(2, 'L', 68.0581377353869), (0, 'H', 88.15726964130869),
(4, 'L', 97.4501582588212), (3, 'H', 92.98550136344437),
(7, 'L', 87.75945631669309), (6, 'L', 90.43196739694255),
(8, 'H', 111.13662092749307), (15, 'H', 91.44444608631304),
(10, 'L', 85.43615908319185), (11, 'L', 78.11685661303494),
(13, 'H', 108.2841293816308), (17, 'L', 74.43917911042259),
(14, 'H', 64.41057325770373), (9, 'L', 27.407214746467943),
(16, 'H', 81.50506434964355), (12, 'H', 97.79700070323196),
(19, 'L', 51.139258140713025), (18, 'H', 118.34835768605957)],
dtype=[('id', '<i4'), ('name', 'S1'), ('value', '<f8')])
b = array([ 0, 3, 5, 8, 12, 13, 14, 15, …