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我想将数据帧的索引列转换为数组，但我不确定该怎么做。我已经将第二列转换为数组，但由于某种原因它在第一列上也不起作用。以下是我尝试转换索引列的方式:
time = df1.as_matrix(columns = df1.columns[:,0])
但是我明白了
too many indices for array
这是我的数据框
df1
Out[13]:
0
2015-11-19 23:59:54.500 -20.186533
2015-11-19 23:59:54.625 -20.272575
2015-11-19 23:59:54.750 -20.185249
2015-11-19 23:59:54.875 -20.247126
2015-11-19 23:59:55.000 -20.205975
2015-11-19 23:59:55.125 -20.281376
2015-11-19 23:59:55.250 -20.238962
2015-11-19 23:59:55.375 -20.300100
2015-11-19 23:59:55.500 -20.311625
2015-11-19 23:59:55.625 -20.264126
2015-11-19 23:59:55.750 -20.266762
2015-11-19 23:59:55.875 -20.224825
2015-11-19 23:59:56.000 -20.211288
2015-11-19 23:59:56.125 -20.163288
2015-11-19 23:59:56.250 -20.254587
2015-11-19 23:59:56.375 -20.125738
2015-11-19 23:59:56.500 -20.146749
2015-11-19 23:59:56.625 -20.161976
2015-11-19 23:59:56.750 -20.126276
2015-11-19 23:59:56.875 -20.082863
2015-11-19 23:59:57.000 -20.030237
2015-11-19 23:59:57.125 -20.098312
2015-11-19 23:59:57.250 -20.146214
2015-11-19 23:59:57.375 -20.030476
2015-11-19 23:59:57.500 -20.018661
2015-11-19 23:59:57.625 -20.029900
2015-11-19 23:59:57.750 -19.970963
2015-11-19 23:59:57.875 -19.994637
2015-11-19 23:59:58.000 -20.097612
2015-11-19 23:59:58.125 -19.952700
