将数据框重新排列为 1 列和 1 个索引
Rearranging a Dataframe into 1 column and 1 index
我有以下数据框,我想创建一个新的数据框,其中一列是唯一的罢工(无重复)和一个索引(TimeUntilExpiration-唯一值),中间值是对应于唯一组合的值TimeUntilExpiration 和罢工。
TimeUntilExpiration Strike Mid
0 0.010959 22.75 2.325
1 0.010959 23.00 2.200
2 0.010959 23.25 2.100
3 0.010959 23.50 1.975
4 0.010959 23.75 1.875
.. ... ... ...
307 2.043836 25.00 1.455
308 2.043836 26.00 1.015
309 2.043836 27.00 2.795
310 2.043836 28.00 0.395
311 2.043836 29.00 0.205
尝试了很多方法和映射,但似乎没有任何效果。感谢任何帮助:)
也许你想?
>>> df.pivot_table('Mid', 'TimeUntilExpiration', 'Strike')
Strike 22.75 23.00 23.25 23.50 23.75 25.00 26.00 27.00 28.00 29.00
TimeUntilExpiration
0.010959 2.325 2.2 2.1 1.975 1.875 NaN NaN NaN NaN NaN
2.043836 NaN NaN NaN NaN NaN 1.455 1.015 2.795 0.395 0.205
pd.melt(df, id_vars=["TimeUntilExpiration",'Strike'], value_vars=["Mid"], value_name='Mid values').drop('variable', axis=1)
结果:
index
TimeUntilExpiration
Strike
Mid values
0
0.010959
22.75
2.325
1
0.010959
23.0
2.2
2
0.010959
23.25
2.1
3
0.010959
23.5
1.975
4
0.010959
23.75
1.875
5
2.043836
25.0
1.455
6
2.043836
26.0
1.015
7
2.043836
27.0
2.795
8
2.043836
28.0
0.395
9
2.043836
29.0
0.205
我有以下数据框,我想创建一个新的数据框,其中一列是唯一的罢工(无重复)和一个索引(TimeUntilExpiration-唯一值),中间值是对应于唯一组合的值TimeUntilExpiration 和罢工。
TimeUntilExpiration Strike Mid
0 0.010959 22.75 2.325
1 0.010959 23.00 2.200
2 0.010959 23.25 2.100
3 0.010959 23.50 1.975
4 0.010959 23.75 1.875
.. ... ... ...
307 2.043836 25.00 1.455
308 2.043836 26.00 1.015
309 2.043836 27.00 2.795
310 2.043836 28.00 0.395
311 2.043836 29.00 0.205
尝试了很多方法和映射,但似乎没有任何效果。感谢任何帮助:)
也许你想
>>> df.pivot_table('Mid', 'TimeUntilExpiration', 'Strike')
Strike 22.75 23.00 23.25 23.50 23.75 25.00 26.00 27.00 28.00 29.00
TimeUntilExpiration
0.010959 2.325 2.2 2.1 1.975 1.875 NaN NaN NaN NaN NaN
2.043836 NaN NaN NaN NaN NaN 1.455 1.015 2.795 0.395 0.205
pd.melt(df, id_vars=["TimeUntilExpiration",'Strike'], value_vars=["Mid"], value_name='Mid values').drop('variable', axis=1)
结果:
index | TimeUntilExpiration | Strike | Mid values |
---|---|---|---|
0 | 0.010959 | 22.75 | 2.325 |
1 | 0.010959 | 23.0 | 2.2 |
2 | 0.010959 | 23.25 | 2.1 |
3 | 0.010959 | 23.5 | 1.975 |
4 | 0.010959 | 23.75 | 1.875 |
5 | 2.043836 | 25.0 | 1.455 |
6 | 2.043836 | 26.0 | 1.015 |
7 | 2.043836 | 27.0 | 2.795 |
8 | 2.043836 | 28.0 | 0.395 |
9 | 2.043836 | 29.0 | 0.205 |