Pandas 枢轴产生“ValueError：索引包含重复条目，无法重塑”
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时间：2020-09-14 04:33:59 来源:igfitidea点击:
Pandas pivot produces "ValueError: Index contains duplicate entries, cannot reshape"
提问by A_Matar
I have a pandas table formatted as following:
我有一个格式如下的Pandas表：
anger_metric metric_name angle_value
0 71.0991 roll 14.6832
1 71.0991 yaw 0.7009
2 71.0991 pitch 22.5075
3 90.1341 roll 4.8566
4 90.1341 yaw 6.4458
5 90.1341 pitch -10.1930
I need to create a view of this that pivots it to sth like this:
我需要创建一个视图，将它旋转到这样的地方：
anger_metric roll yaw pitch
0 71.0991 14.6832 0.7009 22.5075
1 90.1341 4.8566 6.4458 -10.1930
Here is my code:
这是我的代码：
df2= results.pivot(index='anger_metric', columns='metric_name', values='angle_value')
# results is the pnadas table/list
I get the following error:
我收到以下错误：
ValueError: Index contains duplicate entries, cannot reshape
How to handle this?
如何处理？
回答by cs95
Try pivot_table:
尝试pivot_table：
df
anger_metric metric_name angle_value
0 71.0991 roll 14.6832
1 71.0991 yaw 0.7009
2 71.0991 pitch 22.5075
3 90.1341 roll 4.8566
4 90.1341 yaw 6.4458
5 90.1341 pitch -10.1930
result = df.pivot_table(index='anger_metric',
columns='metric_name',
values='angle_value')
result.columns.name = None
result
pitch roll yaw
anger_metric
71.0991 22.5075 14.6832 0.7009
90.1341 -10.1930 4.8566 6.4458
回答by YOBEN_S
By using unstack
通过使用 unstack
df.groupby(['anger_metric','metric_name'])['angle_value'].sum().unstack(-1)# you can using `mean` instead of `sum`
Out[433]:
metric_name pitch roll yaw
anger_metric
71.0991 22.5075 14.6832 0.7009
90.1341 -10.1930 4.8566 6.4458
