我正在使用以下代码将networkx图转换为python中的Numpy矩阵：
a = networkx.attr_matrix(G, edge_attr='length')
产生以下输出：
(matrix([[ 0. , 0. , 1.2, ..., 0. , 0. , 0. ],
[ 0. , 0. , 0. , ..., 0. , 0. , 0. ],
[ 1.2, 0. , 0. , ..., 0. , 0. , 0. ],
...,
[ 0. , 0. , 0. , ..., 0. , 0. , 0. ],
[ 0. , 0. , 0. , ..., 0. , 0. , 0. ],
[ 0. , 0. , 0. , ..., 0. , 0. , 0. ]]), [u'2103498021', u'2103498020', u'2103498023', u'113989403', u'113989405', u'1710872366', u'3685289122', u'3685289123', u'3685289120', u'3685289121', u'3685289126', u'3685289128', u'3685289124', u'3685289125', u'1270530876', u'3685289129', u'1270530979', u'113994337', u'1270530844', u'4263217243', u'3685282301', u'2937091496', u'2937091497', u'1270531058', u'2937091495', u'1270531057', u'2937091498', u'113989407', u'3918709551', u'2597724409', u'113989367', u'3685289157', u'3685289156', u'3685289155', u'3685289154', u'3685289153', u'3685289152', u'3685289151', u'3685289150', u'1629018759', u'113987788', u'2937103124', u'1629018754', u'1629018756', u'114069275', u'113987780', u'1629018753', u'113987782', u'3262155880', u'3262155881', u'3262155882', u'3262155883', u'3262155884', u'3262155885', u'3262155886', u'3262155887', u'3262155888', u'3262155889', u'1270530802', u'1270530803', u'1270530801', u'1270530807', u'1270530805', u'2528097856', 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在矩阵的末尾，它有rc_order。如何使用代码访问rc_order。
由于