python - rpy2 - 如何将数据帧作为 RData 文件保存到磁盘？

Question

我想知道如何将 pandas 数据帧保存到 .RData 文件，如何从 pandas 数据帧保存到 RData？我这里有最后一步的所有内容:

import pandas as pd
import rpy2
from rpy2 import robjects
from rpy2.robjects import pandas2ri
pandas2ri.activate()

# load RData file
df = pandas2ri.ri2py(robjects.r['get'](robjects.r['load'](path_to_rdata_file)))

.... do some processing to df ...

# save df as RData file
r_df = pandas2ri.py2ri(df)
??????????

如何将 pandas 数据作为 .RData 文件保存到磁盘？

Answer 1

我终于找到了答案，以下是使用 pandas 数据帧写入 .RData 文件的方法:

首先将数据帧转换为 R 数据帧:

r_data = pandas2ri.py2ri(df)

然后我们必须将数据帧分配给“R 工作区”中的变量:

robjects.r.assign("my_df", r_data)

最后，我们可以通过名称引用变量以调用save命令:

robjects.r("save(my_df, file='{}')".format(filename))

Here are 2 helper functions if you want to read/write RData files but work in python with pandas:

# read .RData file as a pandas dataframe
def load_rdata_file(filename):
    r_data = robjects.r['get'](robjects.r['load'](filename))
    df = pandas2ri.ri2py(r_data)
    return df

# write pandas dataframe to an .RData file
def save_rdata_file(df, filename):
    r_data = pandas2ri.py2ri(df)
    robjects.r.assign("my_df", r_data)
    robjects.r("save(my_df, file='{}')".format(filename))
    os.chmod(filename, 0o777)