Pandas -如何将r dataframe转换回pandas？
Pandas -如何将r dataframe转换回pandas？
提问于 2013-12-17 17:14:23
我使用下面的代码将pandas df转换为r：
import pandas as pd
import pandas.rpy.common as com
import rpy2.robjects as ro
from rpy2.robjects.packages import importr
rdf = com.convert_to_r_dataframe(df)如何将rdf转换回pandas df？
df = f(rdf) ?回答 3
Stack Overflow用户
发布于 2015-02-20 00:43:13
根据lgautier的建议，这可以用pandas2ri来完成。
下面是将rpy数据帧(rdf)转换为pandas数据帧(pd_df)的示例代码：
from rpy2.robjects import pandas2ri
pd_df = pandas2ri.ri2py_dataframe(rdf)Stack Overflow用户
发布于 2013-12-18 00:16:56
考虑到您的导入，它看起来是：
com.convert_robj(rdf)例如,
In [480]: dfrm
Out[480]:
A B C
0 0.454459 49.916767 1
1 0.943284 50.878174 1
2 0.974856 50.335679 2
3 0.776600 50.782104 1
4 0.553895 50.084505 1
5 0.514018 50.719019 2
6 0.915413 50.513962 0
7 0.771571 49.859855 2
8 0.068619 49.409657 0
9 0.728141 50.945174 2
10 0.388115 47.879653 1
11 0.960172 49.680258 0
12 0.015216 50.067968 0
13 0.495024 50.286287 1
14 0.565954 49.909771 1
15 0.992279 49.009696 1
16 0.179934 49.554256 0
17 0.521243 47.854791 0
18 0.551241 51.076262 1
19 0.713271 49.418503 0
20 0.801716 50.660304 1
In [481]: rdfrm = com.convert_to_r_dataframe(dfrm)
In [482]: rdfrm
Out[482]:
<DataFrame - Python:0x14905cf8 / R:0x1600ee98>
[FloatVector, FloatVector, IntVector]
A: <class 'rpy2.robjects.vectors.FloatVector'>
<FloatVector - Python:0xf9d0b00 / R:0x140e2620>
[0.454459, 0.943284, 0.974856, ..., 0.551241, 0.713271, 0.801716]
B: <class 'rpy2.robjects.vectors.FloatVector'>
<FloatVector - Python:0xf9d0878 / R:0x125aa240>
[49.916767, 50.878174, 50.335679, ..., 51.076262, 49.418503, 50.660304]
C: <class 'rpy2.robjects.vectors.IntVector'>
<IntVector - Python:0x11fceef0 / R:0x13f0d918>
[ 1, 1, 2, ..., 1, 0, 1]
In [483]: com.convert_robj(rdfrm)
Out[483]:
A B C
0 0.454459 49.916767 1
1 0.943284 50.878174 1
2 0.974856 50.335679 2
3 0.776600 50.782104 1
4 0.553895 50.084505 1
5 0.514018 50.719019 2
6 0.915413 50.513962 0
7 0.771571 49.859855 2
8 0.068619 49.409657 0
9 0.728141 50.945174 2
10 0.388115 47.879653 1
11 0.960172 49.680258 0
12 0.015216 50.067968 0
13 0.495024 50.286287 1
14 0.565954 49.909771 1
15 0.992279 49.009696 1
16 0.179934 49.554256 0
17 0.521243 47.854791 0
18 0.551241 51.076262 1
19 0.713271 49.418503 0
20 0.801716 50.660304 1使用文档：
In [475]: com.convert_robj?
Type: function
String Form:<function convert_robj at 0x13e85848>
File: /mnt/epd/7.3-2_pandas0.12/lib/python2.7/site-packages/pandas/rpy/common.py
Definition: com.convert_robj(obj, use_pandas=True)
Docstring:
Convert rpy2 object to a pandas-friendly form
Parameters
----------
obj : rpy2 object
Returns
-------
Non-rpy data structure, mix of NumPy and pandas objectsStack Overflow用户
发布于 2019-05-26 13:35:07
使用r_df读取rpy2数据帧。它将避免出现"FutureWarning: from_items已弃用。请改用DataFrame.from_dict(dict(items)，...)“的弃用警告。
type(r_df)是"rpy2.robjects.vectors.DataFrame“。
type(pd_df)是"pandas.core.frame.DataFrame“
pd_df = pd.DataFrame.from_dict({ key : np.asarray(r_df.rx2(key)) for key in r_df.names })
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原文链接：
https://stackoverflow.com/questions/20630121
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